1 definition by BillyBob the Hick

Top Definition
A game similar to the classic punch buggy. Every time one sees a yellow vehicle, they slap the person next to them and say "slapjack!"

Originated from Oshawa.
-yellow car drives past-

Girl: SLAPJACK! *slaps friend*
by BillyBob the Hick July 17, 2009

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