1 definition by Kevin Regan

Top Definition
When one party hits a second party's genitals with the back of their opened hand. They must also say, "Gershwin," for it to count.

Try it on a friend today...or better yet and unsuspecting stranger.
Tim and Jon are singing in chorus when Snyder sneaks up behind them. Snyder says, "Hey guys." They turn. SLAP! "Gershwin!"

by Kevin Regan April 11, 2006

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