To tell someone no or to reject someone's advances.
1. After being rejected by a hot woman, Jake walked back to his laughing friends.
"Hahaha you got nah dawged so hard."
2. After Justin told his boss he wouldn't take an assignment, one of his coworkers asked him what happened.
"Did you really just nah dawg our boss?"
"Yeah, I nah dawged the shit out of him."
