homosexual; in caribbean spanish slang the word for homosexual is "pato". Pato literally tarnslates to duck. The sound a duck makes? Quack, quack.
My co-worker came out to me last nite. I always knew he was quack quack.
by ari* January 14, 2008
The sound uttered to signify that someone just got scammed or publically shamed.
A guy fails at picking up a girl and walks back to his friends. He is met with a chorus of "Quaaack."


"That sucker got seriously quacked by the salesman at GoodGuys. Buyer Protection Program? Quack!"
by Owen Powers Donovan July 30, 2003
to say yes, or to agree to something
Rod: "Hey dude I got that new album by snoop, wanna go back to my crib and bump it?"

Beef: "Quack"
by Swag King Sonny. July 19, 2011
In poker parlance:

1) A deuce/two.
2) Two of something -- usually an amount of a bet.
"Quack quack!" -- Paul Magriel, announcing a bet of $22,000.
by Versatile Agent Zero! November 07, 2006
A pseudomedical "professional" who earnestly believes in their products or procedures (as opposed to a fraud, who knows he is full of shit and just wants to make money), which in actuality are of dubious merit and are possibly injurious.
(Name) the quack (my chiropractor)
Was a squat little ape
With a mouse's voice
And a pigeon's gait
by Anon343 March 16, 2008
An online or e-slut who will often prey and stalk pre-pubescent teen boys via the internet.
Quack and nightfall cyber while playing WoW.
by Tom Bolton November 04, 2006
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