The Sweet Business is an Exotic Weapon in Destiny 2.
It’s a random drop from Quests, Heroic Public Events, PVE and PVP. It also existed in the Beta, where it was obtainable for Titans in the first mission (but this is no longer the case in the full game).
Exotic Name: Sweet Business
Type: Primary Weapon, Auto Rifle (Kinetic)
Item Description: “I love my job.”
Special Ability: Payday — Larger magazine. Increased accuracy when firing from the hip.
Acquired by: Random drop from Quests, Heroic Public Events, PVE & PVP.