IUD SIS or SIS IUD

In the Song "F*ck the pain away" by Peaches one of the lyrics is IUD SIS then later she mentions to stay in school
the acronym siply means "Stay in School, Injustice Under Dog"

"IUD SIS, Stay in school 'Cause it's the best."
simply Backwards SIS IUD

IUD SIS or SIS IUD

by Coco Loco Croco October 15, 2008

Si Fu

Used to describe someone who is a master at something.

Wow you're so great si fu!

by Anonymous November 08, 2003

Bro-sis

a sister (usually biological) who is also a bro, displaying all or some of the characteristics of a bro.

Not to be confused with brosis which is an infectious disease.

My sister is totally a bro-sis.

Last night my bro-sis had a party at which she wore a polo shirt, drank beer from a red plastic cup, and shouted "WHOOOO" loudly several times.

by Leonardaturtle February 23, 2011

Si papi

Si papi is used during sex, oral or anal (doesn't matter). It means yes daddy.

Girl: Si papi!
Guy: Yea, you like that

by Fuck me mommy February 06, 2018

Periodt sis

PeriodTTT SIS is commonly used by black women if they can’t spell don’t say it. Period point blank sis

Daniel: bruh jada trynna fuck bro

Bradon: yea bro

Jada : nobody want you ugly ass dusty ass

Nikki: Periodt sis ohlkurttt

by Impaytonom May 14, 2019

Step sis

A term used to say meaning, "I want to have a threesome with you and my dog".

Haiden: HAAAAY step sis

by Funnygirlincanada October 17, 2019

bruh-sis

Bruh (a male friend or buddy).
Sis, shortened for sister.

Bruh-sis - a sister who is your buddy.

Hey bruh-sis what's up buttercup?

by Marc's Always Right April 03, 2016