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1.
The response to any "why" question that anyone asks you.
Young Peter: Why did all the dinosaurs die out?
Tour Guide: Because you touch yourself at night.
by 0niTTRay October 08, 2003
683 83
 
2.
The truly ultimate responce to any kind of stupid or annoying "why" question, or simply to a question you cannot answer.
That answer will totally piss off annoying kids who ask too many questions.
See also: because you're gay.
Kid: Why did the dinosaurs die out?
Tour guide: Because you touch yourself at night.

Son: Why do you drink so much, dad?
Dad: Because you touch yourself at night!

Little brother: Why don't you ever let me into your room?
Big brother: Because you touch yourself at night, you little brat!
by Urban_Fellow June 24, 2006
281 93
 
3.
One of the most popular theories as to how the dinosaurs become extinct.
Why did the dinosaurs die out?

Because you touch youself at night!
by AndyAML July 30, 2003
139 23
 
4.
a funny phrase to say after any question
Friend: Why do i suck?
Me: Because you touch yourself at night
by Killinphil November 08, 2008
42 66