When the heat in a room (esp. humidity) is significantly raised due to the presence of so many bros.
"Man, we were watchin' Goodfellas at Caleb's and it got so broasty in there I couldn't stand it."

"Man, it's so broasty up in here... man I could CHOKE on that broastiness"
by mr. soze July 13, 2008
Get the Broasty mug.
exclusively male version of the title, coastie

broasties are usually seen around campus, hitting on some of their coastie chicks, and paying for their Starbucks and/or Pinkberry with mommy's black card

similar, but not exact, to guido: a broastie is not always a guido, and a guido is not always a broastie, but one could be considered both
A: Man, what did you do today?

B: Well, first I got an orange mocha frappuccino, then I went tanning, and then I dropped half a stack at American Apparel

A: (under breath) godforsaken broastie
by the greek goddess May 2, 2010
Get the broastie mug.
Not toast, nor bread... a broastie is an Australian term for a piece of bread cooked for about 10 - 20 seconds in a toastie machine so it gives the bread a toasted line down the centre of the bread and warms it slightly.
Carl: G'day Bruce, how long should I cook this broastie for?

Bruce: Flaming galah! For about 15 seconds mate, until you get the line down the middle.

Carl: Bonza mate, cheers!
by foxious-maximous September 13, 2010
Get the Broastie mug.