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2.
a superbly powerful urination
Lauren: God Ainsley, you must've had to pee like Seabiscuit!

Ainsley: Dudeman, major whiss watch alert!
by NORWHEN March 21, 2010
 
1.
when a fat guy cant be bothered to say what, so instead says whiss
"i hate you"
"whiss?"
by joshan October 15, 2006