A bro, who notices there are too many nerds at a party and kicks them out into the cold for the sake of the hosts street cred and to create a enhanced party atmosphere. Reminiscent of Stalin exiling academics to Siberia for the stability of the USSR.
Jim: There's way too many nerds at this party.
Steve: Yeah we need a Brosef Stalin to get shot of them.
Derived from the term "Brosef." Brosef Stalin is a buzzkill. Someone who ruins other people's good times with his/her presence and/or mannerisms. Generally only stoners would refer to someone as "Brosef Stalin"
"Chill out, Brosef Stalin. You're totally harshing my mellow."