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A form of saying "what's up?," derived from the poor grammatical abilities of a man in Bradford, PA. Wal Sul has been manipulated over time and still can be, due to a liberal vernacular. It's main region of use is NW Pennsylvania.
Dude, I just saw your mom stroking the next door neighbor.

Wait, wal sul dude?
by Shamiee December 06, 2011
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