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1.
A sound made by complete fools in completely random situations. Involves shouting out these three interconnected words with a distinct emphasis on the "LEZ". Also has assisted actions to bring emphasis

Variations include the horizontal, running, and drunken.
When everyone is standing around with nothing to say, or even better in someones mid sentance, some fool shouts out:

LEEEEEZZZZZZZZ-LEY-BOOM
by Phil Shak April 21, 2003