Comes from the combination of the words "bonus" and "toast." Legend says the word was first uttered at the discovery of an unexpected extra piece of toast. Today, it is commonly used as 1) an exclamation of excitement; 2) as an adjective toward the cause of the unexpected emotion; or 3) as a direct noun, Bonus Toast.
1. "Wait, Obama is president? You mean we finally got a black man as president? Boast!"

2. "That shit was boast when the guest performer came onstage."
by BlackELKer June 24, 2009
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A fat kid who says the word bro a lot and thinks he’s just big boned and muscular. Typically plays sports, but acts lazy in doing so. Will push kids out of the way in the hall way to get to class. Often loves deep dish pizza and baked beans.
β€œBro! I’m better than you!” Screamed Boast.

Some kid pushed me out of the way to get to class today, so he must be a Boast.
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by Patriot77πŸ‡ΊπŸ‡Έ February 19, 2019
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Noun. In jailhouse vernacular a boast is a form of yard poetry that is developed to brag about a renown pimp, hustla or playa's deeds. Yard poetry is the origin of modern rap. Inmates had no musical accompaniment yet music became an essential form of entertainment for inmates trying to get through their bid.
Here is a classic boast, replete with examples of jailhouse vernacular, entitled:

"Cipher's Boast"

Of myself, I freely admit, besides some small shit I ain't got no game

But I once knew this sly hustlin, fly dressin motherfucker who'd built himself quite a name

As quiet as its kept you may not know of the longshoe of the century

So let me deal out the holecard and put you wise to his pedigree

Cipher, from the street he attained kingpin status through concentration and kilos and pimpin hoes with big asses

He wore vines displaying taste well ahead of his time

And sharkskin kicks, bustin hoes in the ass who refused to turn tricks

But he always dealt solid to those in his flock and as much as it may come as a shock

He only layed out lames who tried to lay him two ways

You know some Lames just can't take the weight, but like a stone cold noble he did his bid and went straight!
by Suvonoge July 20, 2008
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To get high or to smoke weed. It can be used as a verb or as a noun such as in the case of having some boast or some boasties.

Origin: San Diego
Hey man, wanna get boasty?
Care to boast?
Hey man, got any boast?
That was some good shit. I'm boasty!
by pubrtt February 26, 2007
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