Ruler of the Saviors is Negan, one of the most feared person in the apocalypse though he is a human ruling the safe zone or maybe sin zone. If someone doesn't die in the apocalypse they surely will die in this place. Your father Negan is not a slang speaker. Not knowing any slang words he is in his world. But, he does try to get on your pace. Today, you used the word 'no cap', making him confused obviously, he doesn't know what that means.

Negan: "Ya mean you ain't wearing any cap, sweetheart?" He says, leaning back on the couch and resting Lucille on his shoulder with a sigh.