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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!'
biy by WhiskyDrinkinBiy January 31, 2005
Related Words
'Believe In You'
BIY by LilRockit January 1, 2017
Book It Yourself
“Omg, I’m so stressed and have no time to get on the next flight. Can you help me out?”

“...BIY...”
BIY by Hdudvdjff September 2, 2020

Suit biy 

A major gimp who listens to lassie tunes. Likes to ruin the DBM’s fun by taking down their minted flags at the fitbaw. His da, suit biy senior is the person thought to of given suit biy his gimpyness. Suit biy was given the birth name of Stuart ‘gimp heed’ Marshall.
Suit biys a gimp lol x
Suit biy by LolYerDa69xoxox June 30, 2018
BelieveInYourself!
BIY JlispyProb!
Meaning in a short time normally no longer than 2 hours
Will do in a biy
Biy by The man who does words March 13, 2022