Top definition
A very special three-some involving two females (preferably related) and a male that involves, but is not limited to, the male being sandwiched by the two chicks with his dick in one girl's ass while the other has a strap-on and is doing him the ass at the same time.
Jon: So, how was Nicki and her cousin last night?
Simon: It was great after I got the two of them in bed. They were down with the sime sandwich, extra pickle and mayo.

Simon: How bad do you want to be in a sime sandwich?
Jon: I want to so bad! So bad!
by Cap'n Snatch April 07, 2008
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