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1.
ctn
cant talk now
CTN, doing homework.
by D4N February 20, 2004
 
2.
CTN
CTN means can't talk now used when your doing something important.
by Don Chellz January 04, 2012
 
3.
ctn
ctn = cannot talk now
This is an abbreviation used by people having blowjob while messaging on internet
Bob: Hey whats the English HW?
Chad: CTN, i'm getting a blowjob
Bob: Turn on your camera then and lemme see
by Bob Dole January 03, 2005