a cleverly shaped piece of cloth designed to hold the external labia from slapping each other and create the much dreaded "vaginal slapping noise", also referred to as a "snatchsmack" or a "chesterfield". Normally only happens to overweight women because the fat weighs the flaps of skin down. Sometimes vagina trousers are equipped with absorbant material to collect any unwanted drippage.
"That girl over there is emitting chesterfield as noise pollution! She needs a fucking vagina trouser!
by johnathan edwards November 19, 2007
The ripping of your trousers to create a vagina like split. If it is on a women it reveals her actual vagina giving a point of easy entry for a man to perform a Dirty Dungeon Pirate.
Eve: Oh it appears I have a Trouser Vagina.
Pete: Yes looks like it's time for a Japanese Crab Stroker.
Pete: Yes looks like it's time for a Japanese Crab Stroker.
by Nex Solo May 12, 2011
Connor: Piggy back! *Izzo gets on*
Izzo: Pete, you get on now!
*Pete jumps on*
Pete: FUCK SAKE! Just got a trouser vagina! Don't fuck me guys! Please.
Izzo: Pete, you get on now!
*Pete jumps on*
Pete: FUCK SAKE! Just got a trouser vagina! Don't fuck me guys! Please.
by Pete616 May 12, 2011