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J.K. Rowling's fifth novel, Harry Potter and the Order of the Phoenix. Popular shorthand amongst bloggers.
"Did you read my blog last night about OotP?"
"Nooo! I haven't read it yet, and I don't want to read any spoilers before then!"
by Liz April 01, 2005
Acronym for the popular baseball simulation game, Out of the Park (Baseball) put out by Sports Interactive.
I enjoy playing OOTP
by blindswordzman August 04, 2006
Out of Toilet Paper
Guy 1: Dude! I'm OOTP! Toss me a roll!
Guy 2: *hiding a roll* That sucks, I just finished my roll.
by Mr. Facetious March 11, 2012