When you go to the bathroom in somebody else's house, typically during a party, and rather than piss directly into the toilet, you put the seat down, stand on it and spin around, pissing all over the bathroom, making helicopter sounds if so desired.
"Hey Drew, these kids are being complete fags so I totally just helicoptered their bathroom!"
"Hahaha! Well that's what they get, charging me for a cup"
"Go team venture"
"Fuck man, somebody was helicoptering in the bathroom and it got on my toothbrush!"