When you (typically as a heterosexual male) want to refer to your other male friend(s) but u not gai so you do not want to say boyfriend(s). An extremely useful word for when you are talking to the opposite sex and do not want to come across as gai.
Girl: Hey Gabe, do you want to get dinner tonight?
Gabe: No, I'm already hanging with my friendboys tonight, sorry.
Girl: Your what?
Gabe: My friendboys. You know, my friends who are boys but are not boyfriends.
Girl: Marry me.
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