a person who makes jokes:one wag shouted, ‘On that count you’ve got about three supporters!’
verb (wags, wagging, wagged)
[with object]Australian/NZ informal
play truant from (school).
mid 16th century (denoting a young man or mischievous boy, also used as a term of endearment to an infant): probably from obsolete waghalter 'person likely to be hanged' (see wag1, halter1). The verb dates from the late 20th century