Woohoopie is when there is two (or more) people having sex with each other at the same time. It could also mean one who is bisexual (bi).
it may or may not have been used in the Sims.
Guy 1: Oh, Alex, I love when both you and he woohoopie me!
Guy 2: Dick, I'm sure us 3 will be fuck-buddies until the end of time.
Guy 3: Enough talk, lets get on with the woohoopie!

Beth: Ew, is that Alex? He looks like he just got banged!
Chelsey: Of course he did, didn't you know he's woohoopie?!?
by Ariadne Phyllis April 25, 2010
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