Top Definition
Something that is so unbelievably awesome that you are overcome with the urge to declare your love for it in front of all your friends.
Me: Dude did you see Ice Princess? It was mutherfuggininsane-o!
Friend: Riight...

Me: Holy shit! You mean I can get fourteen jr. bacon cheesburgers for only 3 bucks! That's mutherfuggininsane-o.
Wendy's Cashier: Riight...
av joshg4 6 maj 2006
5 Words related to mutherfuggininsane-o

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