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I like this

http://thesurrealist.co.uk/slang

It's funny because almost all of them are believable. Some are just plain odd though.

Some examples:

officer
adj. to be in a (sexual) relationship with someone.
"Is it true that Grandma and Grandma are officer?"

penis
n. a club which the speaker wants to shout at.
"I'm gonna shout at your penis, dude."