I think we already do that with words anyway. If someone replies to you with something along the lines of “my sweet summer child”, “tu quoque” or “hey dawg…” yo

I think we already do that with words anyway. If someone replies to you with something along the lines of “my sweet summer child”, “tu quoque” or “hey dawg…” you’ll need to know the context to get what they mean. Verbally your voice tone will bring 1000% more context. IMO the “you need to know it” part is exactly why it works on many levels, as unfriendly it can be to new people from outside. I would say that’s part of speaking idiomatically.