What is S.i.s.?
1.
An acronym for Sudden Insanity Syndrome
Joan Crawford had a lot of experience with S.I.S. moments.
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2.
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.
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When a male ejaculator, carefully jisms's on the womans overgrown pubic hair, then ripping the glue like combination of the hair, a..
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When someone screws up and their parents find out and get angry and prohibit them from doing stuff. A teenager form of grounding.
Marc..