One opposite comes from the psychological difference between dominant personalities and submissive ones:

A sadist is someone who derives pleasure from inflicting harm or pain. A masochist is someone who obtains pleasure from receiving punishment.

I assume that you're asking "what does it mean when a college girl asks if you have ever done a girl hardcore?"

Well, hardcore sex... hard to define! By Hardcore I'd say it's more than just vanilla sex

(Vanilla sex, cut from Wikipedia.com , the free encyclopedia

The missionary position, a typical example for vanilla sex. "Vanilla sex (or conventional sex) is a description of what a culture regards as standard or conventionalsexual behaviour. Different cultures, subcultures and individuals have different ideas about what constitutes this type of sex. Often, it is interpreted as sex which does not involve such elements as BDSM, kink, or fetish activities.")

It's the same really, just rougher and harder sex, maybe tied down, with a bit of slapping on the ass.... Stuff like that.

Of course you have BDSM/ BD/ SM sex, which is harder I'd say. BD= Bondage and discipline/dominance and submission. SM= Sadism and Masochism. It all depends on what she lays in the word hardcore, but since this is college girl, I'd say it's most likely hardcore without the BDSM. :)

Ask her! Tell her (IF you have) that you've done it rough, but not any tying down. Or if you have, say that... Everything in sex varies, so it's hard to check!