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1. When two objects smack into one another.

2. An incredibly good goth / industrial band, who make sensual, beautiful music. Discover at www.collide.net
1. The car collided with the wall.

2. This new Collide album has made me do a merry little dance in it's honour.
Collide by StigmataMartyr July 30, 2004
Leona Lewis' new single, due out early August
Can't wait to hear Leona Lewis' new single Collide
Collide by heyhilol July 12, 2011
Definition - used as a exclamation! when two people have similar ideas, or, share convergent thought patterns.

Gestures - it is often accompanied by a hand gestures. where the persons two hands are clenched and brought together.

Pronunciation - the word collide is said with the emphasis on the -ide. which is typically drawn out. i.e. COL-I...DE! as to sound as though the word collide is spelt with several I's

Origin - within the scientific academic elite of the UK, the word collide developed an alternative meaning to the traditional use within the English language. the word COLLIDE! used at the end/or beginning of a sentence has been incorporated into popular scientific language throughout many universities and associated social circles.
person A: the elements in this rock suggest is is formed from melted mantle contaminated by the crust.
person B: COLLIDE! i was thinking the same thing

person A: i fancy eggs for breakfast
person B: COLLIDE! (its funny you should say that), i just this moment put them on

Worlds Collide Theory

A theory which states that a man must keep his personal life (i.e. friends) separate from his relationship side (i.e. girlfriend). Should the two worlds come into contact with each other (by means of his girlfriend becoming friends with his friends), both worlds blow up.
"If Relationship George walks through that door, he will kill Independent George! A George divided against itself, cannot stand!" - George Costanza
Worlds Collide Theory by Elmer January 22, 2005

Worlds Collide 

An expression used when someone introduces a real life friend to their internet life, or on rare occasions, vice versa.
User 1: Hey guys, this is my real life friend. I got him to make an account.

User 2: WORLDS COLLIDE!!!
Worlds Collide by Sonic101 March 1, 2009