Usually bestowed by drunken girlfriends riding upon the shoulders of their boyfriends at concerts while shouting "Wooooo!" with so much gusto that they momentarily lose the grip of their sphincter, releasing a torrent of the previous night's Taco Bell visit down the gentleman's back - much like a chocolate rooster tail.
" Yo - Charline gave Tommy a Mississippi Chocolate Rooster Tail at the Phish concert last night, Brah! Totally ruined his Ed Hardy tee, son!"
Mark bent over the back of a chair by the door after a self administered enema, anus pointed eye level, waiting for Kyle to open the door so he could chocolate rooster tail him.
A hardo is a person who tries extremely hard at everything. Most times a hardo will try very hard at things that do not require excessive effort. For example, sports practices, gym class, etc.
Wow did you see Jack at practice today? What a hardo!