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A boy with a cute, non existant or flat bum. Usually an athletic and attractive teenage boy.
"omg , look at luke's ass!"

"yeah, i know, what a saggy bum"
by Asses are us. November 29, 2009
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someone who is always a bum and doesn't care what they look like
you're a saggy bum.
you're dressed in sweatpants all the time, you saggybum.
by olivialynne July 13, 2012
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