“Get off of me” vs “get off me”

Equally as common, natural, and correct.

I use get off me when I’m getting frustrated. Get off of me is usually when I pet someone’s dog and I’m done with them on me. “Ok sweetie, get off me now.” Wanted to add, Get off me is a command. So usually not used when wanting someone/something to get off of you politely. GET OFF ME!!! can be seen as rude. 🤣

“Off of” can always be shortened to “off”, but both are used 

both are correct, you'll also here "get offa me" as of sometimes gets said as and "uh" sound

Both are fine in my opinion, but pedants and traditionalists seem to have a visceral negative reaction to "off of". While growing up, I had many teachers mark me wrong for using "off of".

I know this is a grammar syntax question but, I would like to add a semantic angle. Get off OF me implies extreme closeness and more urgency to the request. Say someone who is heavier than you is lying on top of you and you start struggling to breathe you would say "get off of me". The second one may be someone leaning on you and it's irritating you so you say "get off me" and push them away. Gramatically, they are interchangeable as others have pointed out.

Twenty or thirty years ago *off of* was hardly ever heard in my area of Britain and would have been regarded as incorrect. The teachers at my school would have picked me up if I'd said it Now it's commonly heard. Personally, it doesn't sound natural to me but I speak BBC English rather than a regional variant