Pronounced as if you were a very large
African American male, "Jeaboi" can be said to a to a friend of yours as if you are agreeing with their statement.
Shortening of the word "Yeah Boy", and taking internet spelling into
consideration, "Jeaboi" is a slang way of pronouncing "Yeah Boy".
Yeah: Agreeing, as in "Yes".
Boy: A person relative to your
conversation.