A euphemism for jacking off. The man downstairs is referring to an individuals genitalia. By showing him who’s boss, you are beating him, aka beating off, aka jacking off.
Man, work has sucked today. I think I’m just gonna go home and end up showing the man downstairs who’s boss.
by WiltMichaels November 25, 2022
Get the Showing The Man Downstairs Who’s Bossmug. by Alyxd July 20, 2020
Get the Bossedmug. by Thesecondboss July 17, 2023
Get the Gross Bossmug. stelica boss is a 1.7k pr romanian Fortnite player who plays on console.He often wants to play with players with over 1k pr even though he can't even place a launch pad. That's why we often mock him for this act.
by salamdelamagazin August 8, 2021
Get the stelica bossmug. 
1. a person who is in charge of a worker, group, or organization.
2. an enemy in a videogame, typically with greater health than other enemies in the videogame, and typically encountered at the end of a level, world, or whatever
2. an enemy in a videogame, typically with greater health than other enemies in the videogame, and typically encountered at the end of a level, world, or whatever
by the random. February 18, 2022
Get the bossmug. A girl with a boyfriend who flirts with other guys for her own amusement and/or free drinks. Oftentimes her boyfriend will be present at that very same bar.
Hey man, watch out for the boss over there, she is just chatting up that guy for a taste of his Patron.
by bronxminotaur March 2, 2009
Get the Bossmug.