Is a sister much like an evil step sister
that you get pasella when you marry the idiot that you thought was the love of your life but is actually a lazy motherfucker who still needs his ass wiped by his mommy. Anyhow Sister-in-law is nother like a sister most of them are fat ugly bitches that should just die horrible painfull deaths. To narrow it down they are ugly bloodsucking wankers.
that you get pasella when you marry the idiot that you thought was the love of your life but is actually a lazy motherfucker who still needs his ass wiped by his mommy. Anyhow Sister-in-law is nother like a sister most of them are fat ugly bitches that should just die horrible painfull deaths. To narrow it down they are ugly bloodsucking wankers.
5 years ago:
Bianka: Hi my name is Bianka I love your brother.
Sister in law: You are not good enough for my brother he deserves to be with someone like Britney Spears.
Today
Sister in-law: OMG my brother deserves better.
Bianka: o go fuck yourself ugly bitch I think he deserves Britney spears they are both useless fuckers that are soooo stupid and they both have smelly arm pitts.
Bianka: Hi my name is Bianka I love your brother.
Sister in law: You are not good enough for my brother he deserves to be with someone like Britney Spears.
Today
Sister in-law: OMG my brother deserves better.
Bianka: o go fuck yourself ugly bitch I think he deserves Britney spears they are both useless fuckers that are soooo stupid and they both have smelly arm pitts.
by ma se tjops October 17, 2008
Get the Sister in-lawmug. see also PITA
a) the female sibling of a person's husband or wife.
b) a troublemaking sibling of your wife who spends all waking moments trying to cause trouble between you and your wife.
c) (WVA only), see Aunt Gladys.
a) the female sibling of a person's husband or wife.
b) a troublemaking sibling of your wife who spends all waking moments trying to cause trouble between you and your wife.
c) (WVA only), see Aunt Gladys.
by ADubbs July 19, 2005
Get the Sister-In-Lawmug. The woman who doesn’t come to your wedding because she has more important things to do, yet expects you to pay for half of her wedding and will upend the entire family unless she gets her way. She is usually supported by your mother-in-law who somehow always takes her side in every possible argument.
Your sister-in-law thinks she’s entitled to you paying for half her wedding yet she has the audacity to not even come to your wedding.
by Xxxxxxxxfanboyxxxxxxxxxx November 13, 2020
Get the Sister-in-lawmug. The woman who doesn’t come to your wedding because she has more important things to do, yet expects you to pay for half of her wedding and will upend the entire family unless she gets her way. She is usually supported by your mother-in-law who somehow always takes her side in every possible argument.
Your sister-in-law thinks she’s entitled to you paying for half her wedding yet she has the audacity to not even come to your wedding.
by Xxxxxxxxfanboyxxxxxxxxxx November 13, 2020
Get the Sister-in-lawmug. The sister of my girlfriend/boyfriend. For when you're not in a lawful/legal relationship with someone, but still have a close relationship with their relatives. Relative-In-law is a legal relationship. Relative-Out-law is a relationship with no legal standing.
Man, my sister-out-law is hella cute.
by Willuknight November 1, 2017
Get the sister-out-lawmug. My double-sister-in-law is a good person.
by Rwopazaq November 24, 2019
Get the double-sister-in-lawmug. 
Get the co-sister-in-lawmug.