Definitions by Blindside Blitz

Rattlesnake leg 

Telltale sign that you are pissing off your wife, girlfriend, and/or significant other. With legs crossed, the leg on top starts bouncing at an increased pace the more agitated the subject becomes (usually a lady).

Wow, your sister looks really hot in her new bikini.........oh, oh there goes that rattlesnake leg.

Rattlesnake leg by Blindside Blitz June 11, 2011