"Holmes" (L is not silent) is the correct Ebonics pronunciation which has a history of being used equivalently with, "dude", "guy", "man" or similar non-familiar alternatives not in the third person.
It was made popular in late 60s East Coast slang, and then later devolved into, "homes" (silent L) at which point it was incorrectly assumed to be short for, "homeboy".
"Homeboy" is typically expressed as a familiar, friendly term often in the third person.
Unlike homeboy, holmes can be used in a variety of ways to denote friendship, aggressiveness, or dubious curiousity.
"What you lookin at holmes?"
"Nice score on that one holmes!"
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