Top Definition
Internet shorthand for "I see dead people".
Mostly used to describe a feeling of insanity after playing FPS games for too long.
Player 1: Dude are u OK? u've been playing cs for 8 hours in a row -.-
Player 2: yea... isdp
Player 1: lolz go get a sleep
by MrDavidSmith March 04, 2008
4 Words related to isdp

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