From Brotato Wiki
You can equip up to 12 weapons at a time
-5% Damage for every weapon you have
How to Unlock
Collect 5000 materials
Unlocks Chopper if you win a game with Multitasker:
Multitasker starts with a large selection of weapons to select from. It is noteworthy that Stick gains more base damage for every stick you have, making it a powerful choice.