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1.
To gloat or brag about something
He was boasting about his fly girlfriend.
af Orbital 18. juli 2005
 
2.
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."
af BlackELKer 24. juni 2009
 
3.
To brag about something; to show off.
The girls in school like to boast about being popular.
af speechless10 2. januar 2010
 
4.
Burnt toast, to boast is to burn your toast or be presented with burnt toast by another.
Dude: Hey man thats some burnt toast

Brian Badonde: BOOOO Boast!!!
af samisamazing 3. juni 2011
 
5.
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!
af Suvonoge 20. juli 2008
 
6.
Previously defined in Merriam-Webster's Unabridged Dictionary as "to say or tell something to give others a high opinion of one." It applies to Urban Dictionary in the sense of many useless humans attempting to make new terms in the form of their own names and typing in useless comments about themselves. One can only guess that they do this in order to receive validation and/or seek validation by the rest of the population.
Sarah had such piss-poor self-esteem that she had to go on a what was once good site like Urban Dictionary to boast about herself and make others think she is actually a decent human.
af Andromeda1232 17. januar 2009
 
7.
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!
af pubrtt 26. februar 2007