Theising 

Joining a game server and doing something such as grabbing the flag or getting better weapons before anybody else can join.

How does he already have our flag?
Aww man, he's theising us!

Theising by Jean S Alose May 19, 2013

Theising 

The act of awkwardly walking up on a private conversation between others and listening in and eventually joining

ERIC STOP THEISING!!!

Theising by jswish23 May 19, 2018

thesising

v. to thesis; to write one's thesis

I spent all last night thesising.

thesising by dudechick May 6, 2008

Teising

A completlely useless and dissappointing performance.

Yo nigga why you be teising like dat

Teising by GMM301 December 9, 2021

Theisinger 

the most bad ass name in all of history. Originating in Germany theisinger has become world renown and has the power to overcome all sources of evil and lack there of. If you know a Theisinger, beware or befriend him and give him $50 daily or he will kick your ass/kill you. Take your pick.

HOLY S*!+ ITS A THEISINGER!!!!!

Theisinger by Brothainarms October 27, 2011

Teising

A person that is audacious, chatty, and loud
Sometimes in a good way

I couldn't watch the movie because of that teising in the back.

Teising by Joemommma February 15, 2009

Theiving 

Acting out of context, not acting normal cause of someone

Damn son, that man Steve be theiving, just because his female not there he acting weird

Theiving by Ashley ryes November 21, 2019