Top definition
Not Cool. Letting someone know that what they just said/did wasn't cool.

Also used as a emoticon on msn.
Marcus:"I just set your house on fire, baby!"
Cornelious:"Dude, notklkl."
by Cody Hauri June 11, 2007
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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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