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A shambam is the product of dating ambiguity. When a man believes he's in a relationship with a woman, but has not yet consummated said relationship by rounding second base, then a shambam may occur. Typically, a shambam will involve a club night, where the man will accompany the woman to a venue believing they will leave together. But the woman, believing herself to be unattached, hooks up with another guy and spends the night with him. For our unlucky bachelor, a shambam has occurred.
Mark hooked up with Iris? But I thought she was with Jordan? I guess it was just a shambam.

You mean she slept with Dan? But she went out with Adam last night. I guess she really shambammed him.
shambam by A.C. Gonshor August 9, 2007

shabamalama dingadanga 

the best thing in history, an expressive phrase for any situation.
"my cat died"
"shabamalama dingadanga"

shabambastic 

A word invented to describe just how beautiful Katelyn is, because there were no other words.
Katelyn is so shabambastic that she gives me an uncontrollable wild boner.
shabambastic by peter July 23, 2004
Basically, its pretty much something you yell when you
A) win at sports
B) tell an amazing diss
C) say something cool
Yeah, son we just beat you bad. SHABAAM
or
Yo mama SHABAAM
Shabaam by DinoGoesRaawwwr March 3, 2009
That's amazing
After somebody pulls off a great skateboarding trick

"Hey, dude, shabbam!"
Shabbam by Olly January 8, 2004
When you win an argument, Or get one over on someone.
Eg. "Dude, she just totally shambammed you!"
shambam by Ellz202 May 1, 2007