Frat is a verb
Fraternity is a noun and usually an adjective.
I'll offer a more neutral perspective. If Greek life is prominent at your school, and you enjoy the culture, hazing, drinking, connections, and lifestyle, go for it. It is an incredible experience and the people I met will be my friends forever. My faculty advisor still eats lunch with his pledge brothers weekly.
If you aren't interested in the style, attitude, etc. and disdain it, don't bother. Don't half ass it joining a lame low tier organization. Go your own way, there's other clubs that cater to you.