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A whammy is another word for 'penis', the opposite of a U.K. Fanny. It adds new meaning to the game 'Guitar Hero', where you use a whammy stick to get extra points.
*Pretty girl walks by*
Man: Wow, my whammy just got very hard.
Whammy by Hannie D July 12, 2007
Making a fist and hitting someone in the butt cheek as hard as you can using the palm side of the fist.
"Ouch! That whammy you just gave me is really painful."

"I just gave Melvin a whammy so hard it's going to leave a welt there for a week!"

"What the hell is wrong with you? What possessed you to give me a whammy just now?"

"WHAMMY!"
whammy by Shmishews February 27, 2009
Bunk sex or drugs. Something not good.
Kurt sold me a whammy.
Whammy by Toya December 8, 2004
to have group sex (orgie)
Those hillbillies had a family incest whammy last night, what sick freaks.
Whammy by Dude October 11, 2003
originated from the movie Anchorman. Generally used instead of "i told you so".
Walker:We dont have school today.
Me: Yea we do.
Other guy:Yea we do have it today.
Me: WHAMMY!
whammy by adam shuf January 18, 2008