Etymology 1
As a greeting first attested in 1859, attested first as a cry of sailors and huntsmen (first attested in the 1400s; compare e.g. huzzah, giddyup). Originally from Middle English yo, io, ȝo, yeo, yaw, variant forms of ya, ye (“yes, yea”), from Old English ġēa (“yes, yea”), from Proto-Germanic *ja (“yes, thus, so”); or perhaps from Old English ēow (“Wo!, Alas!”, interjection). Compare Danish, Swedish, German, Norwegian jo (“yes (flexible meaning)”), Dutch jow (“hi, hey”) and Dutch jo (“hi, hey”). More at yea, ow, ew.
Modern popularity apparently dates from World War II (claimed to be a common response at roll calls; see definition 4), and then most intensely attested in Philadelphia, Pennsylvania; it thence spread globally from American dominance of pop culture post-WWII.
Interjection
yo
- (slang) A greeting similar to hi.
- Synonyms: oi, wotcher
Yo Paulie! How's it going?
- (slang) An interjection similar to hey.
- Synonyms: ahoy, oi; see also Thesaurus:hey
Yo, check this out!
Check this out, yo!
- (slang) An expression of surprise or excitement.
Yo, that's crazy, but I don't remember asking.
2021 October 2, Mason Cannon, “Don't Feel Pressured To Declare Your Major Right Away”, in Study Breaks:I have quickly acclimated myself to the standard form of greeting on campus: "Oh hey what’s your name? … Yeah, nice to meet you, what're you studying? … Yo that’s sick!" A script to recite, nearly verbatim, 10 times a day or more.
- (military slang) Present! Here!
- Sergeant: Smith?
Private Smith: Yo!
- (chiefly African-American Vernacular) Emphatic conclusion to a statement.
- 2010, "Kafkaesque" (Breaking Bad TV series, season 3, episode 9)
- JESSE: That is messed up, yo.
Translations
greeting similar to hi
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- Finnish: moi (fi), jou (fi)
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- Indonesian: hoi (id), oi (id)
- Italian: please add this translation if you can
- Japanese: よ (ja) (yo)
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- Malay: oi (ms), hoi
- Norwegian: please add this translation if you can
- Polish: siema (pl)
- Portuguese: please add this translation if you can
- Romanian: măi (ro), mă (ro), băi (ro), bă (ro)
- Russian: йо́у (ru) (jóu)
- Serbo-Croatian:
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interjection similar to hey
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- Finnish: hei (fi)
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- Norwegian: please add this translation if you can
- Polish: ej (pl)
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- Romanian: măi (ro), mă (ro), băi (ro), bă (ro)
- Russian: please add this translation if you can
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expression of surprise or excitement
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- Danish: please add this translation if you can
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- Finnish: joo (fi), jou (fi)
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- Hebrew: please add this translation if you can
- Hindi: please add this translation if you can
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- Indonesian: please add this translation if you can
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- Japanese: please add this translation if you can
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- Korean: please add this translation if you can
- Lithuanian: please add this translation if you can
- Macedonian: please add this translation if you can
- Malay: please add this translation if you can
- Norwegian: please add this translation if you can
- Polish: ej (pl)
- Portuguese: please add this translation if you can
- Romanian: măi (ro), mă (ro), băi (ro), bă (ro)
- Russian: please add this translation if you can
- Serbo-Croatian:
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Etymology 4
From Russian ё (jo).
Noun
yo (plural yos)
- The letter Ё, ё.
Etymology 6
From irregular romanization of the standard Mandarin pronunciation of Chinese 龠 (yuè).