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1. The sound at porcupine makes, while in the act of hitting an upright water bed.
2. Slang for a hip old person.
"... and then Harold ,went on all suicide porcupine on me, y'know all whippyslap."
" Did you see that old person at the concert in the mosh pit?"
"oh you mean the whippyslap?"
by Pen-el-o-pe April 07, 2008
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