one of one

this phrase appears in I know, Trevis scott's song.
Could anyone help me make some sense out of that. At first, I thought it was a typo, and that it was one on one, but all lyrics sites give this line as 'one of one.

thanks in advance.

Tell me, is you still up? (Up)
It's 5 AM and I'm drunk right now
Tell me, can we still ****? (**** that ****)
One of one, I'm in the zone right now
Tell me, am I still?