Plain and simple it means "bitch"
"Wattup kid?"

"Wattup bii!"
by Joshezzy December 22, 2006
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1. Northern Irish (Norn Irish) for 'boy'. Used as a replacement for the typical 'alright mate' used in other parts of the UK.

2. 'Oul biy' Another Norn Irish word for a marijuana cigarette.

3. A greeting from one biy to another.
1. Yeeooo biy! What's the craic? where's the rest of the biys tonight?

2. Well biy, you coming out for an oul biy?

3. 'Biy!' ... 'biy!'
by WhiskyDrinkinBiy January 31, 2005
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Book It Yourself
“Omg, I’m so stressed and have no time to get on the next flight. Can you help me out?”

“...BIY...”
by Hdudvdjff September 02, 2020
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an expression used for anything to express emotion towards sexual innuendos. Most commonly used by Indians, African Americans, Puerto Rican Spices or a mixture of the two.
Person 1: Yea my boyfriend is coming over tonight.
Person 2: Oh Bii!

Person 1: Is that code?
Person 2: Yes it is
Person 1: Oh bii!

by vampdanc3r5103 October 15, 2008
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either a silly dance, a slang, or doing something stupid but interesting.
"I've been able to do the Ni Hi Bii since I was three"

Or

"I Ni Hi Bi yesterday"
by OЯDRALCIO July 19, 2019
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BelieveInYourself!
BIY JlispyProb!
by HINUZVAGETA November 13, 2020
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