n. The rare art of dropping a deuce in a waterless toilet that leaves a skidmark the length and depth of the bowl.
Oh man, I really gotta take a crap!

Go in there!

I can't! There's no water in the toilet and someone already left a skidmark slam.
by LobsterSausage February 11, 2011
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N. The unusual situation of soiling three different pair of underpants in the same day.
What happened to Joey?

He had to go home. He hit a skidmark grand slam.

Man, that sucks.
by LobsterSausage February 11, 2011
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