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1.
Words used by fictional surfing legend Lance Burkhart (played by Laird Hamilton) in the 1987 film "North Shore," when a lull in the waves occurs during a competition.

Used when either term alone is insufficient in expressing extreme disappointment or anger .
Shit dammit!!! GRRRRRRR!!!! I NEED this win!!
by Shagwell April 16, 2008
 
2.
An expression used to describe the feeling of oneself's failures.
Guy 1: Dude, you suck at this game.
Guy 2: ShitDammit!
by PS2man16 February 04, 2013