Top Definition
SIL
Sister-In-Law

Wifes sister, brothers sister.

also see SILF - Sister In Law I'd Fuck
"Man, Your SIL is Smokin hot"
by EVP January 22, 2008
SIL
An abbreviation for Strong Independent Lady.

a) Term used to protect a woman from being called a derogatory name.

b) Term used as code for a mean, mean, witchy, shrew of a woman
You: "Man, my boss is such a $%^&!"

Them: "No she is just a Strong and Independent Lady and you just can't handle that."

You: "Yes! thanks for High Roading me there. You're a SIL too!"

Them: "Thanks!"
by Grymm Deth September 30, 2009
SIL
Shit Intensity Level; From 1 to 10, 1 being a pleasureful dump, 10 being hot-tamale diarrhea.
Guy: Man dude, I had a SIL of 10 just now, shouldn't have had that taco bell last night...

Guy's Friend: Dang dude! That must have hurt!
by hudzell September 29, 2014
Shortened version of School of Information and Library Science.
The SILS program at UNC is supposed to be really excellent.
by Yo386 September 27, 2010
sil
Seizure in laughter, similar to lol.
"Why did the girl fall off the swing?"
"I don't know; why?"
"Because she had no arms, duh!"
"OH, SIL! SIL SIL SIL!"
by srrh August 07, 2004
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