"Head yeah." is a staple phrase in the 'slanguage' of Miketalk . It is another way of saying, "Hell yeah" in it's most basic form.
"Did you ever figure out what the s happened to t?"
"Head yeah, man...f'd me man. That w was s'ing d at that a's house."
That’s Yeah is when something is Yeah term Created by -Alaina Underhill-Junitz-Bee
Person 1: I got big rich
Person 2: That’s Yeah