Top definition
Bros that wear promise rings and constantly listen to the Jonas Bros.

Please note, you can not swim in Brostians, that would be the Broceans.
Unlike other types of bros, Brostians would never dead horse anything, not even other bros in drunken needy times.
by J R. August 11, 2009
Get the mug
Get a Brostians mug for your cousin Trump.