Back home in Ontario, when we do this to someone:
...it is called giving them the finger. (That baby is giving you the finger!)
In Alberta, they call it "fingering", as in, "That baby just fingered me". Or, "Mommy, that guy who babysat us last night fingered me."
In Ontario, that means something much more...personal. Is Alberta the only place where people say this gross thing? I hate it so much. If my kids ever say it, they will be shipped back to Ontario until they learn how to speak properly again.