Remember nights crying, praying to him, Jesus why
He talked back to me, told me you gon' be the best
And I believe him cause I never heard my Jesus lie
I say Amen, got me Meek Mill'n

Meaning

It is pretty notable that Jag is a Christian referring to his lyrics. Christians pray to the Lord Jesus.
So Jag was praying to Jesus one night that he could make it in the rap game, and he told him he would make it. And Jag knew it was going to happen because of all the guidance he has gotten in the past from Jesus.
Amen is uttered at the end of a prayer.
Amen is also a well-known song by Meek Mill.

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