Shitting your head out of your
ass could refer to three things, either;
A, being so mad your head jets out of your
ass;
B, wasting your time trying to
shit your head out of your ass;
C, an incredible feat, such as lifting a car, watching a whole episode of Everybody Loves Raymond and laughing at it atleast twice, or beating up Chuck Norris.
A, "If I have to sit next to that bitch named
Sophie AGAIN this year, I'm totally going to
shit my head out of my ass.."
B, "World of Warcraft is like trying to
shit your head out of your ass,"
and C, "Dude! What are you doing?!"
Dude- " I'm trying to make a myspace video of me shitting my head out my ass!"
"Shitting your head out of your ass?!"
Dude- "Shitting your head out of your ass."