Boiiiiiiiiiiiiiiiiiiiiii 

A 10 - 12 year olds way of trying to sound cool and edgy but 100% of the time make a big fool out of themselves.

10 Year Old: Boiiiiiiiiiiiiiiiiiiiiii look at yo self boi

Me: lol ok

Boiiiiiiiiiiiiiiiiiiiiii by NUBBYNUB May 1, 2018

YE BOIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII 

Basically, it is slang for saying "that's awesome" or "hell yeah"

Jack: Hey wanna go to McDonald's?

Bob:YE BOIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII

YE BOIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII by Lil Kayzee April 9, 2019