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9.
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!"
by Shmishews February 27, 2009
 
1.
The animated little red creature from the 80's hit TV game show "Press Your Luck" who takes away all the contestants' earned money everytime the contestant stopped at a "Whammy" space on the board.
Come on! BIG BUCKS! No whammies!!
by The Whammy Fighter March 19, 2004
 
2.
The pretty girls fat friend
You get the whammy dude.
by elmagneto December 18, 2003
 
3.
a major or otherwise regrettable setback.
The iraq war is a heck of a whammy to the whole US.
by muri April 22, 2006
 
4.
WHAMMY, THE: A hex or a curse that is put on someone. Similar to giving someone the evil eye.
I ran over that old gypsy lady's dog and she put the whammy on me!
by EndoCanuck October 08, 2003
 
5.
A demon that steals money.
"Shit! Get that whammy! HE STOLE MY MONEY!!" said Johnny.
by Kikaider June 27, 2003
 
6.
Doodle of a penis encountered primarily on construction sites, bathroom stalls, and movie posters in the subway
Somebody drew a big hairy whammy on that Bon jovi poster!
by Archgirl79 May 25, 2012
 
7.
Props to a good comeback or for a very good joke
Austin: "Man, you look like shit today."
Kerry: "Yeah, that's cause I was up all night with your mom."
Austin: "WHAMMY!"
by Sheris October 10, 2007