The action of pulling off a used condom after sexual intercourse and spinning it in a propeller-like motion, and then proceeding to slap one's partner across the face with it (likely breaking the condom and spewing its contents across his/her face.)
Yo Louis you shoulda seen it last night man, after we finished banging we fell asleep, and I woke her up the next day with a whirly bird. It was Epic!
The act of picking someone up with two hands, and spinning them in circles over your head. Often used by the staff at WMBC to inappropriately touch campers.
Mustache Bandit: Nice shot Alex! Meet me in the third bathroom stall in five minutes!
Alex: Yipee! Time for a Whirly Bird!
Randy: Will gave me a great Whirly Bird the other day!
HELICOPTER! It is a HELICOPTER! You call that thing a 'whirly-bird' one more time, I'll beat you so bad, your sister's gonna wish she never gave birth to you.