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accronym for Not Together Still Mine, would apply to someone you like and would get angry if anyone else tried to date even though you are not together.
person: wow Jake is looking hella fine
other person: back off brah , NTSM
person: okay okay
by mytamponsfallingout February 21, 2014
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May 3 Word of the Day
Internet persona(s) who happens to follow you and you happen to follow them back and maintain communication with and have a mutual liking for eachother whether it be friendship wise, etc. (Mutuals if more than one mutual)
Monica: Oh yay! I made a new mutual today because we started following & talking to eachother on twitter and we like eachother (so it seems).
by qtheresurrection March 25, 2015
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