co-sister-in-law

The wife of one's spouse's brother.

My co-sister-in-law is a good person.

by Elivaldeq November 24, 2019

Sister

A girl who supposes to be your biggest supporter even when your mad at them. Always loves you know matter what and would do anything for you.

My sister is my favorite person in the world

by Jdhdydjdj April 13, 2019

Sister

Sister
sis•ter noun
a girl who can be sibling or your best friend.
partner of laughs, advantures, games, jokes, dances...
the confident of your biggest secrets; the person who loves you forever.

1. My sister and I went to the Natural science musuem and we had fun together.
2. My older sister visits me during the summer.

by xjnx278 April 16, 2019

Clam Trap Sister

When you and someone else have both slept with the same woman. Similar to Eskimo brothers.

“You had sex with Susan too?!? OMG clam trap sisters for life!”

by BuffIrish62 May 29, 2019

Thiccc sister

Some one is REALLY thick in the butt area, no matter what skin color they are.

Damn, you lookin thiccc sister!

by Thiccc sister June 5, 2019

sister sabotage

the act of ruining someone forever

I can’t believe sarah did that! I am going to sister sabotage her!

by sistermisterlover February 20, 2019

Sister Send It

When you and your friends are hella high and you do stupid shit.

Oh my god Jimmy lets sister send it.

by lil toaster waffle February 26, 2019