I hear and read the term "borrow off" frequently however I say "borrow from" as that makes more sense to me. Is it grammatically incorrect to say, "may I borrow the book off your friend"? In my mind this sounds as though the book is on the friend?
Edit: The use of "off" and "from" isn't solely related to the word "borrow". I hear "off" used in sentences like "I bought it off eBay".