A boy a girl will get with
because it will make her look good.
A trophy boy is a boy a girl will hook up
or sleep with because although she may not have feelings for him, he is extremely hot and it will look good on her reputation.
If a grade 9 girl were to get with a grade 12 guy, he would be her trophy boy.
Not that there is such a thing as just casual sex for a girl...unless she's a slut
because then it's for money.
Jealous Bitch: That grade 10 girl has a boyfriend in university. I bet she doesn't even like him, she's such a slut, he's probably just another one of her trophy boys.
Gossip Queen: Dude, did you hear? That grade 9 girl fucked a grade 12 boy!
Other Girl: Wow, that must be some trophy boy for her!