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1.
SN
Side Note.
usually accompanied by a colon(:)
Today was a very boring day. SN: I just finished my homework and heading to the movies. WOO!
by d[man]phressh October 12, 2009
 
2.
sn
"screen name"

The alias used on screen, whether the screen is the silver screen or a pc screen.
Muarice Micklewhite goes by the screen name of Michael Caine.
by Gumba Gumba March 19, 2004
 
3.
S.N. is the acronym for "side note". It's only purpose is to pretty much have two statuses in one
I had a great time at the football game! S.N. me and bobby got back together <3
by I see an apple tree August 28, 2010
 
4.
SN
An acronym (stands for) for screen name.
Shaniqua: Heyy, on AOL messenger can you tell me Sam's SN?

Connor: Sorry, I don't know his screen name.
by Noam Barnhard March 29, 2008
 
5.
sn
Short form of shitnigga.
In general, a derogatory term or insult that involves people of African-American descent, fecal matter, or both.
Occasionally, it can refer to taking a shit on someone's head.
Kanye: Now Taylor, Im really happy for you, and imma let you finish, but Beyonce had one of the best videos of all time. One of the best videos of all time!

Taylor: You bitchass motherfucking shitnigga (sn)!
Internet lingo: dat bamfsn!
by anonymous113111456 June 22, 2011
 
6.
sn
short form for "social network"
What do you think about FB?

Is a great SN
by Jinko aka Blonde G October 27, 2011
 
7.
s'n
A very shortform of "How is it going?"
which is then "s'goin?"
then to "s'n"
"s'n"

"good, you?"
by Steptoe May 10, 2005