s/n short for screen name as in an internet name used for talkin with freinds or family. usally therer r aim or aol s/n or yahoo sn s
i have a s/n for aim and yahoo
by monkeybutt March 25, 2005
used in internet slang meaning "side note"
This is a really great day. S/N: I can't wait to go to that concert later.
by T_Squar3d April 05, 2011
internet term for "screen name" or "user name"
whats you s/n on aim?
by mad at the world February 28, 2003