Then he said "keep it real & say whatever's under your handkerchief"

from CyHi The Prynce – Hear Me Out Lyrics on Rap Genius

Meaning

The customer gives him a bit of advice. A handkerchief is always on the left side of your suit when you are wearing one. Our heart is beneath our handkerchief so he’s telling CyHi to keep it honest and to always say what’s on his heart in other words his true feelings. The left side of our heart is larger than the right so technically our heart’s are not predominantly centered directly in the middle of our chests.

To help improve the quality of the lyrics, visit “Hear Me Out” by CyHi The Prynce Lyrics and leave a suggestion at the bottom of the page