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.