8
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.
by far_c November 02, 2009
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9
acronym for snicker inside - use instead of LOL when describing what one is actually doing when one chats/texts.
person a: I blacked out last night and lost my pants.
person b: SIS. You friend, are unpredictable.
by omniv0re December 25, 2011
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10
i want you to SIS
by foonster March 08, 2010
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11
An acronym for Sudden Insanity Syndrome
Joan Crawford had a lot of experience with S.I.S. moments.
by Candide March 06, 2008
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12
Shit is Situational.
(forum speak)
Person A: (When z1,) X > Y.
Person B: But when z2, Y > X!
Person C: *facepalm*C'mon guys, SiS.
by ShamayaXI September 10, 2009
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13
An online term that depects ''Smile-In-Sight'' used when you don't go as far as to laugh, but a smile still spreads upon your face.
Janet: ''Stacy totally spilled Kool-Aid all over her dress!''

Wayne: ''SIS. That makes me smile''
by Kevin H***ley July 10, 2008
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14
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!
by IamIwhoIam August 16, 2011
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