to drunkenly steal other people's items of clothes with the express purpose of sleeping in these items of clothes, most commonly only in those items of clothes. ie otherwise nude.

this activity normally takes place in a nightclub/bar late at night, but not exclusively. Certain people are prepared fosterers.
dude, look at her hat, its gnarly. i am totally going to foster in that tonight.
by dom spotley January 16, 2012
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Fosters??? I'd rather suck warm kangaroo piss out of a muddy hole...
by b1ackie June 29, 2013
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i was so thirsty i almost drank a whole 32 oz. can of foster's
by FreQuent FlYer MylEs May 03, 2004
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A short, constantly drunk 20somethingyearold who lives in Austin, TX. When he is not playing in one of his 9080948 local hardcore bands, you will likely run across him terrorizing hipster/fratboy keg parties with his friends, at which time he will be chanting, slurring, or yelling in a distinct southern drawl which only emerges in the ominous presence of alcohol. Be warned, the only intelligible words out of his mouth will be "FUCK", "YO", "DUDE(S)", "RAGE", or "FAGGOT". Foster goes to community college, is an adamant Bush supporter, still lives with his parents, and consumes superhuman quantities of various pills and PBR. he has also been reffered to by the community at large as a "Misunderstood Local Hero" due to his well-meaning but drunken antics.
Foster: "fuuuuckkkk youuuuu faggggotttt!!!!"
"yoooo dude lets fuckin raaaaage!!!!"
"4 more years!!!! troop surge motherfucker!!!"
by SwimFan98 March 27, 2007
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To sign off randomly on people after they IM you.
To be bad at IM
Dude this girl fostered me on IM today it so wasnt chilll man i didnt even mean to say hi to her....
by Luke Foster Frodo October 26, 2010
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"man that leya is a total foster!"

"did you see that foster, Id love to hit that."

by L.E April 08, 2007
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