A great friend but you want to sound cool or you don't want to say his name. So you just yell that my boi, it also has become popular and many YouTubers have shirts that have that's my boi printed on it.
Guy 1: "That my boi "

Guy 2: "You already know"

"What that guy's name again," thinks guy 1

"His name is so long Iand hard to pronounce and I am never, trying to say it again," thinks guy 2.
by DuOnlyWildWilly May 17, 2018
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noun - slang term given to your male best friend.

This is usually the guy that your parents reference you jumping off the bridge with, but really you are such good friends that if he jumps you wouldn't jump with him, you will be at the bottom waiting to catch him.

This is the guy that you don't have to ask to be your best man, he knows he already is the best man.

The one person aside from our creator that knows all of your secrets inside and out.
Person 1: "Are you and Bryant close friends?"

Person 2: "Bryant is my boy. We go way back."
by T20003 May 7, 2009
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The term one males uses to describe his male friends.
At this party my boys and I got into a fight.
by Jon January 3, 2005
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a close guy friend. or a guy that you really like.
"oh... yeah, i love charles, he's my boy"

"oh... John Kerry... that's my boy"
by purple panted homie August 13, 2004
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My Boy - A guy your kickin it with..
I'm chillin with my boy, i'll hit you up when he leaves...
by DEEE;S Nuts March 11, 2010
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a very banal archetype in the form of a famous person someone will use in order to join in on a conversation, despite the fact that they know nothing about said topic.
Soccer? Oh yeah, Lionel Messi! He's my boy!
Rock music? Oh yeah Dave Grohl is my boy!

Hockey? I love Sidney Crosby! He's my boy!

Pokemon? Pikachu is my boy! best one besides Charizard.

Cooking? Gordon Ramsay is my boy!

Nascar? I watch every race! Jeff Gordon is my boy!
by the verb to heh November 29, 2014
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