Sukie is a slang term to tell someone to "suck it". When you say Sukie you make the same motion towards your crotch as you would when you tell someone to "suck it". A comeback to someone who says Sukie to you is to say "If you are pointing there and saying Sukie, you might have a problem". Particularly if you are a girl because people sometimes mistake the word Sukie for "Sushi" like my brother did.
Jack: "Hey Sierra, those jeans make your ass look fat!"
Sierra: "You know what jack, SUKIE!"
Jack: "Sierra, if you are motioning to your crotch and saying Sukie, you should probaly clean it better".