Bui is a Bahamian bastardization of the English word boy.
Bui is generally used to refer to males but in recent times has become unisex.

Bui can be used interchangeably with boy, girl, guy, man, woman, friend, enemy acquaintance, stranger and many more.

To understand Bui more you’ll need exposure to Bahamian culture

Bui is not a true-to-word spelling but is a commonly accepted one. There is generally no accepted spelling for the word bui.

Younger generations (those born approx. 90’s onwards) have taken the word “Bui” and evolved it “Bey” which is pronounced exactly how it is spelt.

Bui phonetically sounds like: bah’yee or buh’yee
Bey is simply pronounced as “Bay” not to Ben confused with the American “Bae”.
1. Bahamian: Ha’ad go bui .
Proper English Translation: How is it going.

2. Bahamian: see! that’s the bui right there.
Proper English Translation: look! there’s the guy right over there.

3. Bahamian: One bui just been in the store and robbed the registers

Proper English Translation: A man came into the store and robbed the registers

4. Bahamian: Bui I’ne know
Proper English Translation: Boy I do not know.
by GolfRomeo242 September 18, 2018
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To take part in the system. Or become mainstream.
"I didn't sell out, Son, I bought in. Keep that in mind."
- Dad, SLC punk

The punk band did a total sell-out buy-in.
by Jamaal Ahmed June 28, 2004
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Something you do when you can't find it on a peer-to-peer app.
I've even tried SoulSeek to get the Barry Manalow LP, shit I'll have to buy
by joly1 September 26, 2003
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a really, really hot asian guy
That bui has got a nice booty.
by nghiem June 23, 2004
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A word of greeting amongst typically, but not exclusively, male Chavs, Townies and Scally's. Derived from the mispronunciation of the word 'boy', it is often used multiple times in the same sentence. It is most commonly used in a friendly manner, although when the enevitable eruption of tension and/or violence occurs between members of the community(ies) to which it belongs, it will be replaced, ironically, with the word 'mate'.
Male 1: "Alright buy? What's 'appnin buy?"

Male 2: "'ere buy did you see the buy other day what smashed that window down KFC in town?"

Male 1: "fuckin' 'ell buy yeh what a nutter innit buy!"

Male 2: "Yeh I know buy. Fuckin' gonna smash the cunt's 'ead in buy my fuckin' sister was fuckin' workin in there at the time wunnit buy. And she's fuckin' pregnant!"

(cycle down to next estate on BMX bikes)

Male 2 to Male 3: "Oi mate! You fuckin' smashed that window down KFC mate my fuckin' sister was workin in there and you nearly killed 'er fuckin baby. You're fuckin dead mate!"
by sd999 February 11, 2014
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When something's REALLY important. The tags "bold," "underline," and "italicize" begin with the letters BUI, hence the term. When someone using BBCode BUIs something, you know shit's about to go down.
Oh damn, he BUI'd "but." There had better be a good reason.
by MegamanTTEX November 2, 2010
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