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A graduate of a high school or college, usually male, who still hangs around his former school. This is usually because said individual is a total loser, is trying to meet younger girls, and has nothing better to do.
"Dude, didn't that guy graduate like two years ago"

"Yeah, but he still hangs around here trying to mac it to freshman girls. He's a total alumnumnuts."
by Hank the Monster October 22, 2009
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