did you see my bag? 

Phrase popularized by Korean-Pop group "BTS" in their 2017 classic hit song "mic drop". The bag refers to their accomplishments and the question is asking whether or not their doubters and antis saw it; because if they had, they would realize that they have nothing to doubt.

Person 1: BTS sucks
BTS, in their hit single "mic drop": did you see my bag?

did you see my bag? by GiveMeTheGreenLight September 23, 2017

did you see my bag? 

This refers to the kpop group, BTS' large amount of accomplishments. It is aimed towards their antis (haters) that say things such as they "BTS aren't talented." "Nobody likes BTS because they're terrible" "BTS are problematic." etc etc.
This phrase features on their song 'MIC DROP'
Bts are, in summary, bragging about their awards and large fan base so that the haters realise they're being ridiculous and should change their mindset and become an A.R.M.Y (bts fan)

Anti: Who even listens to BTS? Their music sucks and they can't sing, rap or dance.
Kim Taehyung, an intellectual : dID YOU SEE MY BAG?

did you see my bag? by volley.ball.dorks October 13, 2017

did you see my bag? 

BTS being savage af towards haters during their hit song "MIC Drop" in the new 2017 album Love Yourself.

BTS: DID YOU SEE MY BAG? DID YOU SEE MY BAG? MY BAG IS FULL OF TROPHIES

Haters: .....wait what I'm shook.

did you see my bag? by Hirilyss November 21, 2017