It's a slang word for Some one who sparks up some thoughts in others or the surrounding and has a hustler state of mind
A really hot French man that comes with everything that you expect from a French romantic, he is tall handsome and strong. If you see one just know that he's never gonna give you up never or let you down.
Shes really sweet at times but if you upset her shes a real bitch. Just dont break her heart and youll have a best friend/partner for life. Shes also queer as shit.
Yo look there, Jmungus can hardly fit through the door his shoulders are so wide.
or
Damn Josh, you've got good potential, keep working out and you will become Jmungus.
or
Damn Josh, you've got good potential, keep working out and you will become Jmungus.