Verb: Using rhinestones to decorate the butt area of one's pants, or other items of clothing, or even one's personal self (like being vagazzled, only on the backside private regions rather than the front).
I can butt chug this PBR faster than I can tell you about my crossfit workout and vegan diet! Oh yeah Bryan? Watch me butt guzzle this 4 Loko during my keg stand.