Haha, well..... just tell them you are working on some project and have a deadline to meet.
just tell them youre busy
That is irritating to deal with. Just tell them you are going to be busy doing stuff around the house. Or that you are not up for company right then. If they get upset than all the better. They will then leave you alone.
Talk non-stop about your dog, even if you don't have one. Hide the liquor and don't offer them any food. Start smoking really smelly cigars and have **** on the television.