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1.
When one individual proceeds to lie naked in-between two other naked individuals in a rigid horizontal state, creating a sandwich of naked individuals.
Dude 1: Dude, did you manage to bone both of those chicks last night?

Dude 2: Nah we were all wasted so we just ended up sandwich planking, i was the filling though so was still pretty sweet
by Plankpimp December 23, 2010