when you take a crap so large it must be flushed twice in order to go down
"i gotta use your bathroom dude, Chipotle is making a comeback"

"ok, dont stink it up"

45 minutes later you hear the toilet flush, then a pause, then flush again.

"whew, that was intense"

"damn dude, if your gonna take a double downer...at least wash your hands"
by kustus April 16, 2010
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A sexual act involving more than one down syndrome person.
Dude, last night I was at this awesome party in a mental hospital and got these two chicks messed up on Tequilla. Slamming double-downer man! Those hoes couldn't work straight or speak straight the next day
by dekor March 5, 2010
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A person who regularly eats two KFC Double-Down chicken sandwiches in a single sitting rather than eating just one.
Look at that fat bitch! I bet she's a double-double-downer!
by suoivun April 22, 2010
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