whoa, Nelly

English

Etymology

From whoa! (a command to slow or stop) +‎ Nelly (a common name for a mule or horse). A popular catch-phrase, together with "Whoa, Nellybelle" on the Roy Rogers TV show (1951–1957).

Interjection

whoa, Nelly

1. an exclamation of surprise, especially one in response to an unexpected acceleration of speed
   • 2020 June 17, The Denver Gazette‎:

     ...the jeep’s brakes never quite worked, even when Brady uttered the catch phrases "Whoa, Nellybelle" or "Whoa, Nelly."