Sinsear 

Someone who lets them dump trains on his or her chest

I just Sinsear'd him

Sinsear by dixass August 28, 2009

SinSeer 

A Paedophile

Get your hands off of those kids SinSeer

SinSeer by Robby O'licious Bacon March 14, 2022

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

synsear 

Synsear is a name that everybody likes. He has a big penis, all the girls like him he is sometimes friendly, amd has a great personality. and u never might know what you get from him

I like Synsear
Synsear has an awesome personality

synsear by Bankhead.papi August 18, 2017

Sinseriously 

To be sincere and serious at the same time.

"Dude, sinseriously, im sorry"

Sinseriously by LilRayRay August 18, 2008

sinserious 

the words sincere and serious together to indicate something such as a sentiment which is seriously sincere.

I'm Sinserious about this; I'm utterly convinced he did it.

sinserious by George D T July 3, 2007

sinseriously 

"sinseriously" is a super fun loving word that can be used to sign a card with. It is a great way to let someone know how much you care about them and that you are serious and sincere about everything you wrote on a letter. It is a cherry on top.

Thanks for being my friend and i hope you enjoy your present

"Sinseriously", Joe

sinseriously by valkayerie July 9, 2011