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2.
A byproduct of having really nice, sexy lower abs and being skinny enough so that your pelvic bones and lower abs form lines

This word was coined by a GRP cabin in girlsville during the summer of 2004, and has spread like mad to describe guys who are fucking studs.
Ari: yeah my def is the shit, too bad i'm such a fatty and dont have a creasnis...oh btw where did nev go?
Hannah: fuck, that guy has such a sexy creasis, lets have a creasnis sit on stratton bald and lose our virginity, and then flick random objects off. ...tuma' ball tuma' ball...
Ari: Bitch!
Hannah: thats not funny
David: this will kick so much creasnis
by Ari... January 10, 2007
 
1.
The pelvic bone or protrusion there of.
I would like to sit in your creasnis
My creasnis is cold
by David Hicks August 09, 2005
 
3.
an indention on the pelvic bone on both sides of the lower stomach : gotten by swimming, lots of pushups/crunches, or just being pretty skinny. if you've got a creasnis, you are freaking lucky.
Person 1: Did you see Scott's creasnis?
Person 2: Its so hardcore! I want him.
by -Hannah- October 15, 2005
 
4.
The most beautiful part of the human body. The crease that is created by the outward extension of the pelvic bone on either side of the lower abdominal area. Usually a result of excessive stomach muscle-building. Widely worshipped by Sherpas in the Himalayas, the creasnis is thought of as a sacred temple in the body that should be respected and well-taken-care-of.
He has a creasnis of generous size, we should roast him on a spit.

My, what a small creasnis you have, have you tried doing some crunches?
by Hannah Breu. July 11, 2006