Shit is Situational.
(forum speak)
Person A: (When z1,) X > Y.
Person B: But when z2, Y > X!
Person C: *facepalm*C'mon guys, S.i.S.
by ShamayaXI September 10, 2009
An acronym for Sudden Insanity Syndrome
Joan Crawford had a lot of experience with S.I.S. moments.
by Candide March 06, 2008
SIS
Due to the vast majority of lies which happens every time a person types 'LOL' in texting or the internet, SIS (Smile in Silence) is a much more proper use in times when one does not actually laugh when typing 'LOL'. Though, this may suggest that the person is not as fun as he did not actually laugh.
A: Yo, B, I just tried walking thru at a drive thru.
B: LOL, what happened?
A: B, stop lying bro, don't tell me you actually laughed at that message. SIS
B: Jeez, such a stickler...So what happened?
A: They told me that they only viewed car owners as acceptable customers.
B: SIS
by Shinigami Prophet July 10, 2014
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!
by IamIwhoIam August 16, 2011
SiS
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
Self-inflicted stupidity. An injury that you caused to yourself by an act of stupidity.
Friend 1: How did you get that cut?

Friend 2: I was running with scissors down the stairs and my shoes were untied.

Freidn 1: Thats some serious S.I.S.
by Ahseetz Mahpants January 16, 2008
SIS
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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