Members of a fraternity on a given college campus. Usually people who enjoy drinking to excess 3-4 nights a week. Mostly majors of finance, econ, other business. Can party all the time and still get high paying jobs out of college because their parents (or friends parents) will hook them up with employment. Frequently referred to as being "gay" by non-frat members who are jealous because they can't get hot pussy.
Frat boys have parties filled with at least a 60/40 girl to guy ratio and bang hot sorority girls...Non-Frat boys go to sausage fests where they bitch about how gay frats are...then go home drunk and alone to jerk off