Urban for "bullshit" but with a connotation of absurdity. Said quickly with the article "Das" before it. Used to reject a proposition so preposterous no one could reasonably believe it.
"I asked my boyfriend if he wanted to have a threesome with my girlfriend Jill but he rejected the idea."
"Das boosit."
"Das boosit."
by ponytrekker April 13, 2010