Formally, good head received from an underclassman girl. Often used when bullshitting to your friends. Colloquially, can also mean sex or any kind of hook up.
Frat Boy 1: Dude, I got some totally FYE CABEZA from this bitch last night,
Frat Boy 2: No Wai!
Frat Boy 1: Ya Wai!
Frat Boy 2: No Wai!
Frat Boy 1: Ya Wai!
by Joel Joplin August 31, 2008