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A fat imbecile. Pun on the name Forrest Gump. Used in the popular TV show Simpsons when police chief Wiggum arrests Homer Simpson.
Homer (sitting on a park bench): Life is like a box of chocolates...

Chief Wiggum: Hold it right there Forrest PLUMP! We have laws against impersonating celebrities.
by Eddy June 27, 2007
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forrest plump is a spoof name of forrest gump instead of the personjust being mentally retarded u r also callin them fat
sando:so so y really did the chicken cross the road?
me:wtf? he is so forrest plump
by ya mum hee hee July 20, 2008
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The vengeful act of crapping on a lover's chest while they sleep.

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