What is S.i.s.?
1.
An acronym for Sudden Insanity Syndrome
Joan Crawford had a lot of experience with S.I.S. moments.
See
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.
See
Random Words:
1.
The sex you get after spending $1209457863145 on your wife/gf or being extra sensitive or cuddly or whatever on Valentine's Day.
..
1.
Visually describes the shape and motion of an unfortunate young lady or many old lady's breasts, where the mass of the breast hangs..