What is min Suga genius jjangjjang man boongboong?

A phrase Korean rap god Min Yoongi/Suga/agust D in popular South Korean boy band, BTS used in a free style rap.

Fangirl #1:omggg did you see min Suga genius jjangjjang man boongboong perform on stage yesterday?
Fangirl#2: Yes he was amazing!

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min Suga genius jjangjjang man boongboong - video