Can I use that?

I don't know that I came up with that but to whatever extent I have rights to the phrase, feel free.

I use a combination of ASL and US military combat hand signals to give direction to my progeny. When I've taught them non-ASL signs, I've made sure to explain: "That's not sign language, that's Daddy Sign." Like with ASL, facial expression can have a significant impact on the flavor of Daddy Sign.