Bumthigh 

The area between your bottom bum and your thigh.

The world gets to see my bumthigh once I sport my brand new bikini.

Bumthigh by xxKaylie June 17, 2007

butthigh

A term to describe when a persons thigh and butt is not distinguisable. This is caused by either fat thighs or a flat butt.

google search: butthigh.
A fat person with rolls under their butt, which makes it hard to tell where the butt ends and the thigh begins.
A skinny person with a small flat butt, which makes the whole backside look like a flat brick.

butthigh by Khang Nguyen January 20, 2008

buthigh

A lack of definition in the glutular region, commonly seen as an almost imperceptible transition between butt and thigh. Often the butt and thigh may appear to be a single, amorphous shape. (pronounced buh-thigh)

Every time Kaitlin "accidentally" changes in front of me, I am lucky enough to see what a buthigh looks like unhindered.

buthigh by Saralita December 25, 2008

Buthigh

Bu-thigh

1 the area where the butt cheek and the top back of the thigh meet

I know this girl with a really sexy tattoo of a dragon just below her ass on her buthigh

Buthigh by Tullihia! July 28, 2009