Used colloquially to represent the idea of having many things to do; it is used in the place of "shit to do" rather you have "hizz to bizz." Orgins of this phrase stem from the phrase "Hoes to Bang" thus became "Hizz to Bizz."
This girl I've beentalking to wants meet at a bar tonight. I told her "yeah I'd be there soon." Too bad ima hit her with the Hizzy Hay and go to a bar across town.