Has pretty much the same meaning as ass. Used when you want to say ass without actually saying ass. Under normal circumstances, an utterance of ass will potentially attract a spanking from one's maternal figure. The usage of assvogel aims to avert this act of child abuse.
Billy: Oh man, you pwned me in nfs2 again!
Wolfgang: Pwn!? You ASS!
Momma Wolfgang: ROAR. *Spank*. ROAR.
--now with assvogel--
Billy: Oh man, you pwned me in nfs2 again!
Wolfgang: Pwn!? You assvogel!
Momma wolfgang: You're a good kid, Wolfy.
Wolfgang: Pwn!? You ASS!
Momma Wolfgang: ROAR. *Spank*. ROAR.
--now with assvogel--
Billy: Oh man, you pwned me in nfs2 again!
Wolfgang: Pwn!? You assvogel!
Momma wolfgang: You're a good kid, Wolfy.
by Grant Hayes July 09, 2005