do me something!

[oreniman]

for example:
- I'm warning you, don't go to him!
- I am going to him, do me something!
is there such saying? I can't find on google examples to this.

also: "I got on it". "I got on him".
when somebody try to hide something from you and you "get on it" - discovering it.
is there such saying? I can't find on google examples to this.

thank you very much

[asesh]

GOGO: A cartoon character.
Go by: Guided
Go with: in line with
etc etc.
I presume your usage of 'go' is alright in modern english.
Asesh

[Tdol]

Do me something- I wouldn't use this. I'd say something like 'What are you going to do about it?' as a way of challenging them.
If you suspect someone, you are 'onto' them, rather than just 'on'.