Flatulence released from the anal cavity, which is powerful enough to project fecal matter at dangerous velocity onto the flatulator's undergarments. A strong wet fart. Otherwise know as a shart, these noisy explosions tend to have a distinct "quack" sound when released past the sphincter.
(ex 1) Shit ran down my thigh as a result of a disastrous quack.

(ex 2) Tony accidentally quacked while trying to light his fart, in this situation a basic joke had become oh so dangerous.
by iLOVEtwat May 22, 2010
an ambiguous verb that can be used in reference to literally anything. Some examples are dying, falling, making a mistake, missing a scoring opportunity in football, etc.
Dude, totally quacked.

He's quacked.
by ykdrummer91 April 17, 2010
A sound made by french people when trying to say yes.
"are you gay?"
by gay frenchie November 23, 2009
to bust a nut or "skeet"
"Dude i totally quacked before she even touched me!"
by WayniakDaManiak August 06, 2009
The strangely annoying squawking sounds that most ducks make.
The duck quacked madly at the flying hamburgers.
by Mongooose August 02, 2009
(v) To reserve for future use, esp. a seat. "Give me my seat - I quacked it 5 minutes ago!"

(n) An agreement that a person has Quacked. "Jason's quack is still in effect for another three minutes."
by tenfour October 25, 2003
in very complicated chipmunk terminology this sound is often referred to as "sex" or even "fuck" in the mating season (12 Months a year).
"Damn woman you look fineee! we should Quack!"

"Why yes, a quick Quack is what i need right now."
by chipmonk182 September 04, 2011

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