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

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