A Koster Foster is a/are sad cunt(s) who can only get by and survive in life by the means granted to them by a host, directly implying they are parasitic. Persons who use lies, deceit, manipulation, abuse, psychological discourse and societal/social sympathies to acquire a foundation to provide for themselves the necessities and luxuries of life whilst giving nothing but lackluster entertainment of flesh in exchange for everything else. Coveted by pathetic beta boys who would never/only very luckily catch the eye of and entertain the opposite sex by subscribing to a norm of paying for bad pussy. Revered by even sadder and often more pathetic females who only value their lives in terms of the price tag attached to their involvement.
You see that girl over there that has no job, car, lives at home with her mom and spends all her time slinking around the same bar every night? She is looking for prey, she is such a Koster Foster its not even funny.
by Phuck Yuh August 23, 2019
Get the Koster Fostermug. by MMCBuddha666 March 30, 2023
Get the Foster Breathmug. foster shitty - a way for san mateans and hillsboroughites to show their superiority.
Dan: "I live in Hillsborough, wbu?"
Mark: "I'm in Foster City."
Dan: "HAHA you live on trash in foster shitty."
Dan: "I live in Hillsborough, wbu?"
Mark: "I'm in Foster City."
Dan: "HAHA you live on trash in foster shitty."
by arnavvr June 8, 2020
Get the foster shittymug. Sex act in which one takes a can of Foster's Australian lager and a beer bong inserting the hose end into the partners anal cavity and pours the can into the beer bong. The act can include a lego surf guy. Just make sure to tie a string to the surf guy, so you don't have to send the lego diver in after him.
by ludeboi69 March 7, 2016
Get the foster's whirlpoolmug. by Janelle foster December 4, 2018
Get the JANELLE FOSTERmug. by Natsu00420 December 21, 2022
Get the Michael Fostermug. Billy Foster is the worst person you can ever meet. Billy also thinks he is more important than you and is Big-headed. He’s aggressive, bossy, hostile and bitchy. Finally he’s lazy, weak, gullible, cowardly. He even use to play games on a fucking toaster.Most of all he puts music commands in the main channel .
by PlsCallMeJimmy January 13, 2019
Get the Billy Fostermug.