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1.
Slang spin off of the word nice. nice --> niche (n-eye-ch) --> sniche (sn-eye-ch). used to describe something either really cool, or sarcastically if it's just terrible.
Guy 1: I felt a sniche buzz in the middle of getting brain from that bittie from that forest lake party because i smoked the fanks right before she came.

Guy 2: Ohhh, SNICHE!
by sjdfgjkdg April 22, 2011
 
2.
A word one gay man says to another in an offering to sex
Gay man one "sniche"
Gay man two "YES!"
by wizard_bro_flake April 11, 2011