When two separate aspects or relationships in a persons life collide: your friends (one "world") become friends with your girlfriend (a separate "world").

Popularized by The Seinfeld episode "the pool guy", in which Georges Costanzas' girlfriend forms her own friendship with Georges' platonic friend Elaine (Causing Georges' worlds to collide).
Kramer: 'Jerry, don't you see? This world here, this is George's sanctuary. If Susan comes into contact with this world, his world's collide. You know what happens then?'

<Kramer puts his hands together and makes explosion sounds that exemplify what happens when there are worlds colliding>

KRAMER: 'Ka shha shha shha Pkooo!'
by Donjulio78 October 30, 2009
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When two people's farts collide and produce a nuclear fart
those two farts just acted like a farticle collider, it smells like big foots dick in here
by pyrosk8r45 April 1, 2009
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A newton's cradle consisting of only 2 giant dicks that mash together. This results in the atomic creation of big dick energy
Chad's penis collider has become unstable, he is creating too much big dick energy.
by Doonutt December 15, 2019
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When a good friend of yours becomes good friends with another good friend of yours.
Mike: My good friend Chris met my good friend Devlin today, and they liked each other!

Kathy: Worlds colliding!
by Mike Cirelli November 23, 2009
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When a guy’s dick is touching a girls strap on
Timmy just got done penis colliding with Lexy
by Fireguy47 September 5, 2018
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