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SIF means "Seat In Front."
It's a term used by unicycle riders to describe a way of doing a trick with the seat in front of you rather then the seat under your butt.
Example: "If you do the hop SIF, you can get more height."
by Ivan J October 28, 2005
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29
Shit
In
Friends
Shoes

You do this when you find out your friends a total dick.
dude i got him back with a sifs.
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30
a short term for silly ignorant fag
jamie: yo adam that ambers being a ryt SIF
adam: ye man i agree what a SIF
by jamie the Great May 10, 2007
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32
Sorry I farted. One would whisper after one farted.
John: "SIF!"
Mandy: "Not again!"
via giphy
by EnglishOK August 19, 2020
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33
Acronym of "Sorry I farted!"
usually used among Westcoast US
"SIF"
"Oh No! not again please"
via giphy
by EnglishOK October 14, 2019
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34
abbriviation of "Sorry I farted"
John: "SIF!"
Lance: "What did you eat yesterday?"
by Bill not gates August 19, 2020
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