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1.
The extreme hunger one gets after school, where you will eat anything in sight.
Tim: "Bro I can't wait to go home and eat that whole box of ice cream sandwiches in my freezer."

Steve: "Sounds like you have serious case of the after school munchies my man."
by brohemith March 18, 2010
 
2.
The process in which any student from 7th grade & up feels as though they're going to die unless they consume atleast 3lbs of snack food.
"Dude Im never inviting John back over my house"!

"Why"?

"After-school, he straight up destroyed all my chips ahoy"!

"Ehh . . he probably had After-School Munchies
by TNJ(; September 01, 2010