To the top I aim, testin' waters so up in the flow

from Mac Miller (Ft. Casey Veggies & Joey BADA$$) – America Lyrics on Rap Genius

Meaning

He’s aiming for the top, as to be the greatest. He’s testing the waters in the flow like the flow of water.

The line could also be “testin' waters so I been afloat”, meaning he is testing the waters of the rap game and he is able to swim/float/succeed.

To help improve the meaning of these lyrics, visit “America” by Mac Miller (Ft. Casey Veggies & Joey BADA$$) Lyrics and leave a comment on the lyrics box