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
Strong and muscular.

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

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