A person who attends Greek events simply to get the complimentary t-shirt promoting the date party.
"Sweet shirt, frat-bro. When did you hand out with the tri-delts? Aren't they skanks?"
"Sure are, dude. But, one chick in my 0-level math class asked me to the Helter Delta Skelter date party where I got this neat shirt."
"You're such a shirt whore."