Top Definition
Something sweet that happens, usually out of nowhere. Often the user who says it will move his hands in a vertical motion to accompany the "sirmon."
"Dude, Katy Perry is coming to our dorm room...topless."

"SIRMON!"

or

"Dude, I found the entrance to Narnia."

"SIRMON!"
by Astin December 24, 2008
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