Top Definition
When you do something so undersireable it's akin to sitting, bare assed, on a spiky plant (typically a cactus).
I sat on the cactus last night trying to catch up on the book. OR I was sitting on the cactus for 3 hours trying to finish that movie.
by S.O.K March 07, 2009
5 Words related to Sitting on the cactus

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