What does "frat" mean?

Shortened form of fraternity, college organization. (Often used as a noun modifier.)

What is a synonym for "frat"?

Common synonyms include: fraternity, brother, brotherhood, club, frat house, fratboyish.

/fɹæt/ noun

noun ·Uncommon ·Advanced level

Noun

1
Shortened form of fraternity, college organization. (Often used as a noun modifier.)
"frat party"
2
a social club for male undergraduates wordnet

"Tom got drunk for the first time at a frat party."

Apocopic form of fraternity.