There isn't a specific male equivalent for "bestie." The term "bestie" is gender-neutral and can be used for both male and female friends.
While some people might use terms like "bro" or "dude" to refer to a close male friend, these terms are more casual and don't necessarily carry the same level of intimacy as "bestie."
It's perfectly acceptable to use "bestie" for a close male friend, as it's a term that signifies a strong and affectionate bond.