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A guy or gal that uncomfortably invites themselves into your personal air space, especially on a first date.
Friend - "How was the date?"
Me - "Horrible; at dinner, he sat, like, two inches away instead of across from me. Ick - what a space invader!"
by Kim K January 15, 2006
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2
Individuals or groups of people who sit next to you in cinemas or on public transport when there are plenty of other free seats available.
I was at the cinema alone the other day when about eight space invaders came and sat right next to me.
by Nick VD October 25, 2006
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3
A classic arcade game where you pilot a spaceship, at the bottom of the screen, shooting aliens that fly from a formation above you and dodging their own projectiles. I can't believe no one has tried to define this term yet.
(Example is from The Simpsons):

Willy: It's impossible for me to fire a pistol. If you'll check me medical records, you'll see I have a cripplin' arthritis in me index fingerrrs. Look at 'em! holds them up I got it from "Space Invaders" in 1977.

Wiggum: Aw, yeah. That was a pretty addictive video game.

Willy: surprised Video game?
by Dark Laith December 05, 2004
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5
often a rich kid or trust funder who moves to your area (especially nyc, la, big cities etc) from a cow poke town and takes up your space, driving rent and all costs of living up. these are especially despised hipsters who start repping the city they've invaded as if it were there own.
ex: Paul moved to brooklyn to attend Pratt, he began saying he was from "BK all day" while his parents paid exorbitant rent so he could hang in nyc, what a fucking space invader!
by Mary Gunns December 03, 2006
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6
When two dudes bang missionary and the top jerks off the bottom.
My boyfriend love playing Space Invaders together! He's real good with joystick.
by slave.of.ganon February 05, 2018
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7
The act of invading another's genital area with your tongue whiile they are sleeping.
My wife was in bed in a deep sleep, gave me a chance to be a space invader.
by Frank Palace January 12, 2012
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