Guising, guizing, a guiser or guizer may refer to: Guising, a Scottish and Irish tradition which is the origin of trick-or-treating Guiser, an amateur actor in a mummers' play Guizer, member of an Up Helly Aa squad Guise dancing, Christmastide community mumming performed in Cornwall Look up guising or guiser in Wiktionary, the free dictionary. See also Guise (disambiguation) Disguise Disguise (disambiguation) Trick or treat (disambiguation) This disambiguation page lists articles associated with the title Guising.If an internal link led you here, you may wish to change the link to point directly to the intended article. Wikiwand - on Seamless Wikipedia browsing. On steroids.