deathonsteroid
Deathonsteroid is more of a adjective than an everyday term. It can refer to the drug Death but with assorted steroid drugs, but most commonly means someone who can't figure out how to get good and gets stuck in low ranks.
Noun: Dude, try this deathonsteroid. When I took it, a dragon's ass came from Mars and blew up New York City.
Adjective: Lol, look at this kid playing Brawlhalla over here. 200 wins and he's stuck in Silver. What a deathonsteroid.
Adjective: Lol, look at this kid playing Brawlhalla over here. 200 wins and he's stuck in Silver. What a deathonsteroid.