someone who chooses their plans based off what looks more fun rather than who asked you first
me: hey so are you coming tonight?

plan slut: no I can't someone just came and picked me up

me: we talked about this earlier before, plan slut
by wooopoooooooooo April 09, 2011
An exemplary example of the female species that will, despite all of your best efforts, manage to fuck up all of your carefully laid out plans by not arriving at the pre-agreed destination with the sole intention to create frustration.
"Whats the matter Tom? You seem down".
"I had a date with Hillary and she didn't show up".
"I tried to tell ya man, she's a plan slut".
by Tenkun August 11, 2008

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