Top Definition
A song or tune that someone starts to sing/hum then every1 else gets it stuck in their heads for the rest of that lesson/day
Several people in History lesson humming/singing the same tune but @ different stages:

Bill (not humming): "God damn Audio viruses, they spread so fast"
Stace (humming): "What?"
Bill: "ARGH!"
by Kinkish Pink October 01, 2005
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