Thank you for remembering the etymology... the earliest instance I recall is some YouTube video circa 2010 making fun of mediocre programmers ("brogrammers") at

Thank you for remembering the etymology... the earliest instance I recall is some YouTube video circa 2010 making fun of mediocre programmers ("brogrammers") at Facebook who got the job based on fraternity connections instead of skill. There were sunglasses involved in the skit. It was at most something you would call yourself ironically (in fact, at least according to my recollection, even "bro" itself was originally a perjorative used to refer to a caricature of fraternity brothers interacting with each other - "ok, bro" etc. - but which they themselves later embraced and adopted).