Yeah, I know what Biscuits are. Believe it or not, if you grow up in Maine, there are a lot of colloquialisms you pick up that are chiefly British; Fag, Biscuits, and rubber are three I can name off the top of my head.
Yup. My grandma still talks about holding a fag in her hand.
Doesn't make British food any less disgusting.
Gravy is the same. Google biscuits or something.