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1.
A graduate of a high school.
I graduated from Bremen High School in Midlothian, Illinois in 1990. My presence is still felt throughout the faculty.
by Saints September 24, 2003
 
2.
A made-up word that people use when they don't know the singularity of "alumnus" or plurality of "alumni." Often used openly by educational institutions.
Guy 1: Dude, that dude's an alum.
Guy 2: A what?
Guy 1: An alum, dude.
Guy 2: What's that?
Guy 1: You know, bro, he graduated from here.
Guy 2: Don't you mean he's an "alumnus"?
Guy 1: No, dude, wtf? Alum. Just like cact and fung.
by PeacePig May 15, 2011
 
3.
a bitch and a hoe
she is an alum
by Sally July 02, 2003