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The first part of the word is short for the word "shit". The second half of the word is short for "nigga", hence "nig".

"shtnig" is used in disbelief or when you can't believe your eyes. When you find yourself shaking your head and you can't believe what's happening, holla with a shtnig.
"Shtnig! Get off of my mothafuckin couch nugga!"

"Shtnig, how you gonna let that soundbwoy snuff you."
by Remus September 07, 2004
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