sinise

Sinise is a very interesting name. She is usually so crazy she cant keep any friends but is very sweet on the inside. Sinises are very skinny and beautiful without trying. A Sinise has a reputation of crushing on other peoples crushes without realizing. She can also scare people away without knowing. Even though she does this, she is so kind and caring :)

Person: Wow that girl is crazy
Other person: she is a Sinise!
Guy: how can a girl be so crazy and hot?!

sinise by Kitty123456 March 4, 2018

The Gary Sinise effect

Having the ability to state the obvious in a monotone voice in any given situation. All while standing over a dead body.

Jeff was giving me the Gary sinise effect yesterday. He just kept stating the obvious about everything I said.

The Gary Sinise effect by LittleBrittle81 August 30, 2013

SinSeer 

A Paedophile

Get your hands off of those kids SinSeer

SinSeer by Robby O'licious Bacon March 14, 2022

Sinisha 

Derived from the Serbo-Croatian word for son, Sinisha is the name of a cool guy. He may be a bit angry at times and maybe a bit rude but you can trust Sinisha to pull through even if things aren't going too great.

Person 1: "Damn, why is that guy so mad?"
Person 2: "Just give him time. He's a Sinisha."

Sinisha by SkiiBoy October 3, 2018

sinister slash 

When you rip open the vagina with two hands so wide you can crawl inside.

I will sinister slash your girlfriend.

sinister slash by Superslickwillyg January 24, 2014

sinseriously 

Emphatically exhibits the sincerity of your seriousness. The classic use is to close a letter with it.

Dear Urban Dictionary:


Thank you in advance for considering “sinseriously” in your Urban Dictionary.

Were sinseriously to be included in The Urban Dictionary, that would make my day, perhaps even my week.

Sinseriously,
Cyprus Denton Fekks

sinseriously by Cyprus Denton Fekks February 19, 2010

Sinistrous Mistress 

A sexy, left-handed woman. Also known as a sinister sister.

She's left-handed and a little bit sinister. She's a sinistrous mistress.

Sinistrous Mistress by yo-yo-ma-ma March 22, 2011