SMJ is short for SuperMarioJames, who is a Mario plushtuber.
YouTube:
@SuperMarioJames
Discord:
@supermariojames
Casting Call Club:
@smj_official-257
An acronym meaning Stan Merinald Jones. He eats at Arby's
gigi: smj your ugly
smj: faggot
gigi: cdn.discordapp.com/attachments/909157244736766005/1010624072507461642/who_is_that.png