Word used to describe the sound made by catapults in the Lord of The Rings movies. Also used as an added word when girating upon seeing someone/something that pleases ones lower regions.
Eg.1: "And then the orcs set off the catapults, and they were like WOOMCH, and then Gandalf was all White Wiz, poppin' caps in they asses."
Eg.2: "Dude, look at the funbags on her! *Pelvic thrust* WOOMCH!"
Eg.3: "Your Mom! *pelvic thrust* WOOMCH!"