" जब की तुज बिन नहीं कोई मोजूद,
तो फिर ये हंगामा ऐ ख़ुदा कया है"
"Jab Ki Tujh Bin Nahin Koi Mojud,
To Phir Ye Hungama Aey Khuda Kya Hai"
The meaning of above lines is that: O God, If there is nobody else present in this world except You, then what is this visibly seen creation / world that I see all around me.
In fact Ghalib had true belief that God is the only reality in this world & in this whole creation it is the God only who is present everywhere & all else does not exist. So as per Ghalib, this whole creation itself is God only, so are all the creatures of the world including all human beings, who too are God only. Nothing exists except God in this world. We all are not separate entities but are one only, as part & parcel of that Universal Soul. In fact we get so many verses in Bhagwat Gita also which say the same thing.
"mattah parataram nanyat
kincid asti dhananjaya
mayi sarvam idam protam
sutre mani-gana iva" (Bhagwat Gita: Chapter Seven verse 7)
"Sri Krishna said: O Arjuna, there is nothing else besides Me, Like clusters of Yarn-beeds formed by knots on a thread, all this world is threaded on Me."
vayuh sarvatra-go mahan
tatha sarvani bhutani
mat-sthanity upadharaya" (Bhagwat Gita: Chapter Nine verse 6)
"Sri Krishna said: O Arjuna, Just as the extensive and all-pervading Air always remains in Space, likewise know that all creation & beings reside in Me."
So Mirja Ghalib had attained the heights of mysticism in his life time as he was able to feel God all around him & was able to feel His existence in every moment of his life. We too should feel the God all around ourselves as then only we shall be able to see every human being & every creature of this existence as part & parcel of God & ourself too.
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