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Australian for 'Tourist'
Q: "Can I have a Fosters"
A: "Bloody tourists"
by Effie1987 October 25, 2012
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
Short for Foster's Home for Imaginary friends. When kids get too old they don't need imaginary friends anymore so they stay at Foster's until they get adopted by another child (presumably with no imagination of their own).
Foster herself is a little old lady who still has her imaginary bunny friend.
Mr. Unicorn, we regret to inform you little Stacy is dead, so you'll be staying at Foster's from now on.
by unicorny July 30, 2006
The worst of all beers.
Fosters??? I'd rather suck warm kangaroo piss out of a muddy hole...
by b1ackie June 29, 2013
In regard to video games, to shoot an opposing player in either the crotch or ass. Also referred to as "Buttering" as in the episode of South Park where Butters shoots everyone in the crotch.
Guy 1: "Dude, you totally just shot him in the dick!"

Guy 2: "FOSTERED!"
by Arkem3 June 25, 2011
no parents / orphan
foster: people with no parents

parents dont want the kids

kids live with their grandparents
by donthavetoknowme1 June 10, 2011
Fosters is slang for 'Good Call' referring to the guys in the fosters advert
Guy 1: Hey, I;m going pub, wanna come?

Guy 2: Foster

Guy 1: Right, I'm going for a cig, you coming?

Guy 2: Fosters on that!!
by R1bby July 28, 2011