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1.
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
 
2.
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
 
3.
sil
something that is described as being cute, little, lovable, italian, gorgeous, and so on. Used when describing a person you feel affection towards.
Myles is such a sil! or Love you sil.
by lil em March 10, 2008
 
4.
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
 
5.
sil
One who is silly, or could be described as such.
Man, that Katie Knutson girl is a major sil! She liked the movie About a Boy and thinks Conan is funny!
by LP_hoss July 10, 2008
 
6.
Should I Leave
This bitch is annoying SIL?
by Zaddie March 01, 2014
 
7.
sil
a shortened version of silly
gosh nyomi! you're such a sil!
by Caitlin C October 27, 2005