look up any word, like eiffel tower:
 
1.
An unusually large amount of semen stored in a man's body due to lack of ejaculation
I haven't jacked off in weeks. I'm backed up.
by Kordz December 23, 2004
 
2.
Strong and muscular.

That teacher, he be backed-up.
by Strongboy July 13, 2008
 
3.
Unable to leave loaf
I ate a whole block of cheese and now I'm all backed up.
by MikePBG November 08, 2003
 
4.
adj. strong or musculer
I am a backed uped to the fullest
by Ghetto Fab July 26, 2003