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mech or mecha 

Giant robot. Refers to humanoid types seen mostly in animé (Japanese cartoons) and Japanese games (i.e. Armored Core). Mechs/mecha can be anywhere from 30 to a few hundred feet tall and are usually pioleted by people. They can be used for many things, like constuction for example, but more often warfare.
The mech picked up the car and threw it at the V.I.P.
mech or mecha by Soul Shinobi October 2, 2003

Mech Bosses (Mechanical Bosses) 

The name for the trio of bosses (The Twins, Skeletron Prime, and The Destroyer) in the game terraria. Usually fought in hardmode. (After Wall of Flesh is defeated)
You: "I just entered hardmode, who do I fight?"
Friend: "The Mech Bosses (Mechanical Bosses). I suggest fighting The Twins first."
You: "Thanks."
A large, mobile suit of tank-like armor. A pilot is inside of the Mech, or Mecha in some cases. Heavily armed, with weapons such as blaster, photon cannons, LRM's, SRM's, and Railguns. Many a game has been made off of the theory of a Mech, and the military is no doubt working on a prototype Mech as I type this.
Mech by DJ Chronos November 16, 2003
1. Greatest Marine ever

2. Jesus Christ himself was the first seat mech, he joined the marine corps in the year 1 and retired as a Sgt Maj in the year 2... yah he was that awesome.

3. Has slept with every known hot woman in the world... leaves all the fat chicks for powerline and ordnance

4. Every seat mech has kicked Chuck Norris' ass at least once.
All the Hot chicks in the world: "WOW seat mech's are the best!"

Jesus: "I remember when i was a seat mech!"

Chuck Norris: "Holy crap if another seat mech whoops my ass im gonna just roundhouse kick myself to death"
Seat Mech by Seatmech April 28, 2008

B.R.U.T.E/Mech 

A robot looking thing commonly used by pussies. Originated by some guy that was on weed using weed as a straw to drink his beer his favorite number 420 hmm.
bro this guys just killed me with a B.R.U.T.E/Mech what a pussy
B.R.U.T.E/Mech by Kangaroo124 August 16, 2019
One with superior knowledge in google, has lots of spare time, can fix anything with anything or nothing at all, beyond chuck norris, makes boredom look fun, life of the party(but not THAT guy or at least makes a good one), has unlimited power over women, and great skills in convincing women to do anything / the ultimate sex machine.
No example needed. If you can't understand, you are a moron or any other shop. Seat mech.
seat mech by trei56 April 3, 2008