Top definition
The constriction of the nut sack due to too much addaroll or other stimulants in the system.

usually apparent when trying to peace your girl after a latenight addie.
1. "i was smashing for hours but got fuckin sponge nut and couldnt finish the job"

2. "she was playing with it for a while but couldnt get it up all the way.. thanks sponge nut.."
by bleezy baby July 23, 2009
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