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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.
backed up by Mudesi December 23, 2004
I ate a whole block of cheese and now I'm all backed up.
backed up by MikePBG November 8, 2003
adj. strong or musculer
I am a backed uped to the fullest
backed up by Ghetto Fab July 26, 2003
Backed up is when u haven't had pussy in so long
Bro I'm backed up, I haven't had pussy in months
Backed up by Varrrr August 20, 2023

backed up to West Buttfuck

when traffic has ground to a halt or crawl for many miles, usually due to rush hour, heavy construction, or a bad accident.
I'm trying really hard to make it to the show on time, but traffic on I-85 is backed up to West Buttfuck!

Backed up woman 

A girl that is involved with another man, she is taken, off the market, unavailable.
John: Hey dude, check that bird out at the bar in the purple dress
Dan: Yer i know mate she is hot
John: I'll see if she wants a drink
Dan: Nahh mate shes a backed up woman (or just backed up)
John: For fucks sake!
Backed up woman by kanerockgod March 12, 2009