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1.
(verb) To go over-the-top on a sexual joke. A weeth usually occurs when one trys to add on to a dirty joke, but as a result, makes the joke too crude.
Person 1 - "I wonder where that guy's strong hand has been?"

Person 2 - "I heard that guy shoved his strong hand up the principal's snatch, making his hand smell like rotten cheese"

Person 1 - "Way to totally weeth that joke."
by Andy Peterson August 15, 2009
 
2.
Another way of saying 'With'
Peek this Streetness, never had a weekness weeth this
by Jimma March 17, 2004