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An acronym for Sudden Insanity Syndrome
Joan Crawford had a lot of experience with S.I.S. moments.
s.i.s. by Candide March 6, 2008
Words you can keep
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.
S.i.S. by ShamayaXI September 12, 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.
S.I.S. by Ahseetz Mahpants January 10, 2009
S.I.S is an acronym for Special Investigation Section.

It is an Los Angeles Police Department's elite tactical detective squad with a straightforward mandate: Track down the City’s most dangerous offenders and take them off the street. S.I.S. are possibly the hardest-working, most dedicated men and women Detectives to wear a badge.
Alonzo: Hey, Mark, where are you transferring to?
Mark: S.I.S.
Alonzo: Yeah, S.I.S. Detective.
(from 'Training Day')
S.I.S by KainJynez June 22, 2009
Means to "sit in silence" insetad of lol. Usually used if somebody sais something retarded online, its a good way to be honest. Lets face it very few actually laugh at stuff online.
xXihateyouxX: i was like "duhhhhhhh" haha
ay u guys 2003: s.i.s
s.i.s by mat a April 24, 2005
suprisingly improved sequel
a movie is an s.i.s if

a) the original was brilliant,yet the sequel was better
b) the original was average and no one expected an improvment
c) the original was pure garbage and no one wanted a sequel. a monkey could make a better sequel but this sequel was actually really good
aliens and terminator 2 are s.i.s type a imo

mad max 2 is awesome, it is an s.i.s type b because the first one was quite boring

mate, the star wars prequels were such utter shyte, im glad revenge of the sith was better, it was a type c s.i.s
s.i.s by evan4401 October 2, 2010
Self inflicted shanks:
Stab wounds that one purposely makes usually to frame someone.
Dude 1: dude he shanked me!
Nigga 1: Naa dats just an S.I.S
dude 2: he was with me he coudlnt have done it
-dude 1 walks off angry-
S.I.S by Brawlar December 18, 2008
More from Urban Dictionary
West Midlands slang word for rockers, bikers, greasers etc. In the late 1980s it was used by the UK music press to refer to a specific scene centered around the bands Pop Will Eat Itself and Crazyhead. The term never found favour with readers of 'the inkies' (Sounds, Melody Maker and the still extant NME) and was soon dropped. Now often used in predominantly working-class areas of the midlands and the north to mean someone who listens to rock-derived music and/or dresses in a manner that suggests they affiliate themselves with rock music of some kind.
Some grebo passed with Sabbath playing on his stereo.
The Poppies are at no. 17? God, a grebo band in the charts!
They're playing nu-metal now, bloody grebos!
grebo by cactuscat September 15, 2006
Word of the Day on August 24, 2026

TikTok Farlands

TikTok Farlands is a term to refer to videos that you see after scrolling for a long time. These videos can potentially be disturbing, or weird. Said videos can also have low likes, or low comments.
“I reached the TikTok Farlands bro”
Word of the Day on August 23, 2026

mormon assault vehicle

another term for a station wagon, mini-van, or any other kind of vehicle that is targeted at the "family" demographic(also M.A.V.)
"Tactical advantages aside, the M.A.V. is top of the line for the holy warrior troop transport manufactured by the Church of Latter Day Saints Military Industrial Complex. Also great for family trips...to heathen lands."
mormon assault vehicle by KVRX January 10, 2005
Word of the Day on August 22, 2026

Shakira Law 

A version of "Sharia Law" that Reform Ltd supporters tend to refer to, often by mistake.
Richard Tice of Reform now lives in Dubai, under Shakira Law, although telling Brits that we should worry about it
Shakira Law by Reformltd February 16, 2025
Word of the Day on August 21, 2026
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