similar to triple tap, the quadruple tap refers to the act of verifying all three fundamental personal items (keys, wallet and phone) are present where they should be, with addition to a less common feature such a cigarettes, insulin syringe, reading glasses, etc.
John: phone - check, wallet - check, keys - check. I'm all set to go.
Jane: you ought to run a quadruple tap, dear. make sure you don't forget your samurai sword.