Top Definition
An intensely insane person with manic tendencies. Can also be defined as a person whose lack of sleep has driven them to insanity.

An extremist with a need for chaos.
"That guy just came at me, out of no where. What an insaniac!"

"I think Tim's been up for 5 days now. He's really turning into an insaniac"

"Dude, I'm going skydive-snowboarding tomorrow. I'm a f***ing insaniac!"
by BK Lounge October 24, 2008
An insane maniac.

Alternatively, an insane insomniac.
Dude, you were an insaniac on the soccer pitch!

"I'm crazy tired." "Does that mean you're an insaniac?"
by Acelyn Dove October 06, 2011
Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.