This is when your plans for the evening include you and your bros going out and doing the same thing you always do.
Bro: What we doin 2nite?
Bro: Blow & Hoes
Bro: So, the brosual..
As a bro makes he's line-up of clothing for the night, he makes an attempt to not show off with nice clothing but at the same time tries to appear better than everyone else. The combination is casual + bro = brosual. a t-shirt, jeans, gelled-hair and an excentuated body makes a casual night that much more bro
"Why was ben dressed so brosual last night ."