I don't understand this meme. What does "boi" mean in this context?
The word "boi" is part of the modern vernacular. It can mean many things depending on the audience or speaker, but it is often accompanied by a hand gesture similar to the second image in the meme above.
The term is used as an exclamation, a term of derision, or as a variant of the word boy, adopted by a special interest community.