A portmanteau of "bestie-oomfie-bruh." One of your best friends who is also a mutual on twitter (oomfie). Whenever they say something you can't help but go "bruh!"
Guy 1: Yo, who's this person who quote tweets all of your posts with "bruh moment"?
Guy 2: That's just my boomfieuh.
Guy 1: Your what??
Guy 2: My bestie-oomfie-bruh!