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12. sis
stay in school, from peaches song "fuck the pain away"
sis iud stay in school cuz it's the best
1. sis
1) Short for sister
2) In the song Fuck the Pain Away by Peaches, SIS seems to stand for Stay In School...
My sis went to the movies with a scumball.

"Stay in school... Cause it's the best..."
by wxynot Jul 12, 2005 add a video
2. sis
Slang for sister
Me and my sis went to the movies.
by Thunderchild Mar 25, 2003 add a video
3. sis
1.) A South African English expression roughly equivalent to the American "yech" and the Afrikaans expression "sies".

2.) An American term of endearment for a sister, now also used in other countries.
1.) Sis, man, you stink!

2.) Hey, sis, hey bro, how's Ma doin'?
by Xaviana Dec 1, 2003 add a video
4. SiS
SiS as in Shit Its Sunday Commonly used on sites like Facebook and Myspace
John: Aw man SiS
Kevin: Dude I know
5. SIS
Snickering in Silence
new for LOL because it applies much more than LOL when texting/typing and trying to be quite
While texting in class i received a message with a prime time to say "thats what she said" and/or "reminds me of my saturday night" or even "I get that all the time" so I sis'd vs lol'ing

"idk what happened it just went everywhere after i touched it"
sis
"reminds me of my saturday night"
6. SIS
Smirk in Silence:
The act of putting on a straight face after putting someone in a spot.
Pulling someone's leg as a group where everyone acts normal in a scenario that is funny.
Used on social networks, chat rooms and forums..at least could be!
Totally loved getting on Spook's nerves acting as if I don't know him at the bar last night. Pulled a SIS.
7. SIS
Secret Internet Shorty, an acronym used to describe pictures of a guys dick but using angles or photoshop to make appear significantly bigger than it really is.
Look at this dickture I just got from this guy! I know know for a fact he is a SIS!
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