buttflex 

Scientifically known as the Valsalva maneuver. This maneuver is performed during defecation. It involves one of the largest muscles in the human body.

That loaf of white bread gave me some major constipation as I had to make multiple buttflex attempts before I could finally free up the load.

buttflex by Jonny Bot November 16, 2006

Buttflix 

The name given to a bad movie ordered from netflix. "Buttflix" is used as a noun, which takes the place of the movie. So one would say, "That movie I watched from netflix last night was a definite buttflix."

"Dude, the movie Crossover was a total buttflix, never order it."

Buttflix by Stevo-K January 1, 2010

Buttflection 

The mirror image of your butt created by the still water in the toilet. Aids in assuring you do not have any cliff hangers before you go to wipe.

I looked down at the buttflection and did not like what i saw. A massive pile o crap had yet to fall into the toilet.

Buttflection by goony44 November 4, 2011