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4.
(1.) When two gangs fight each other. Specifically mafia gangs (they wear trench coats, trench wars...)

(2.) The Columbine Shooting (the kids who shot up columbine wore trench coats)
Aw man, did you see the british vs. italian trench war? It was fuckin nuts!

Man, that John kid was so fucked up. He was talkin about doin a trench war on our school, so I got him expelled.
by Nathan February 28, 2004
 
1.
A server (or 'zone' as they're most commonly referred to) in the online 2d spaceship game 'Continuum'.

The game SubSpace was scrapped by developers Virgin in 1997. With legalities causing a problem, an Estonian programmer who can be credited for developing Skype and KaZaA recoded the game from scratch. The outcome was 'Continuum'. Identical to SubSpace, Continuum was developed with lots of new features such as a banning system known as BanG and is practically impervious to cheats.

Trench Wars boasts the largest player community in the whole game with 600-700 players online at peak times. Trench Wars has a very intricate bot core serving players and adding new features to the game and a strict staff system consisting of 'Zone Helpers', 'Event Referees', Moderators, Super Moderators and Sysops, each with their own monthly quota of tasks to perform such as taking cheater and help calls, hosting different events which change the style of play in sub-arenas and generally being active and serving the community.

The zone has unique settings and a unique style of play. Players fight to control a flag at the head of what appears to be a base shaped like a castle. This style of play is known as 'basing'. Each ship serves it's own purpose and the idea is that all ships must be utilised by each player in order to capture, defend and control the base.
Bloke1> I'm going to play Trench Wars as it offers a better style of play than other zones.
Bloke2> Fair enough.
by Dave Defeat September 29, 2005
 
2.
When two people have a thumb war up someones butthole
Ex: Mark: Yo dude how did it go with two guys and one girl last night?Did you get any action?
Luke: Let's just say i am boss at trench wars
Mark: beanz
by mykittenwearsmittens January 11, 2011
 
3.
Best Subspace server ever. Hosts over 250 different games and events.
I pop into Trench Wars to meet my squad and kick ass daily.
by Brisk June 05, 2004