This is a non-standard spelling variation of the word sinabi, whose root is sabi.
sinabi
told, said
Anong cnabiko?
= Ano ang sinabi ko?
What did I say?
Anong cnabi mo?
What did you say?
= What did you tell (them)?
Cnabi ko sa kanila.
I told them.
Gawin mo ang cnabi ko.
Do what I said.
Gawin mo ang cnabi ni Ana.
Do what Anna said.
Gawin mo ang cnabi ng tatay mo.
Do what your father said.
Gawin mo ang cnabi nila.
Do what they said.
Gagawin ko ang cnabi mo.
I’ll do what you said.
This spelling variation is used only informally, such as in texts and in messages and posts on social media.