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1.
When a guy comes out of the shower, the heat and moisture of the water makes his testicles hang to their lowest point possible

Can also be used to offend See examples below
James is such a WETSACK!

Valentina is crawling on the floor again...what a WETSACK!
by Ðαx×y ßøÿ February 18, 2008
 
2.
A person who will not attend a popular engagement without a reasonable excuse. Popular between scottish friends.
#1"You no' coming down the Pub?"

#2"Aye, no' I'm gonnie stay in and watch Big Brother"

#1"Ya pure wet sack, come down the pub!"

#2"No"
by PureWhetto#1 November 12, 2009