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1.
When you stick four fingers in your girls puss, and your thumb in her ass.

also known as:
four in the hun, one in the gun
four in the pink on in the stink.
Hey jacob, imma give stacy the wrench!
by drunkanfool June 25, 2004
 
2.
'The Wrench' is where one testicle is accidentally and suddenly trapped/squeezed by the central stiching line of your trousers, after remaining in a seated/slouching postition for too long. In sufferers this causes you to involuntarily leap forward/up whilst simultaneously blurting incomplete expletives.

The Wrench can also cause nausea and extended bruising in extreme cases involving Jeans. Also sometimes caused by excessive Gugging on hot days.
I was on the Sofa watching telly the other day. As I leaned over to get the remote, I uncrossed my legs and got a really bad case of The Wrench - I was on the floor for about 15 minutes, crying like a baby trying not to throw up. One of my bollocks is now Grapefruit sized.
by Dobbalina September 06, 2010