Trash is Fun is a co-op survival simulation game for 2-4 players, supporting both local and online play. Players assume the roles of mutated animals, including a duck, owl, squirrel, and hedgehog, in a post-apocalyptic world. The core gameplay loop involves recycling garbage to survive and defending against "Trash-Zombies" using various defensive structures and weaponry.

Survival mechanics are central to Trash is Fun, requiring players to manage resources and defend their base. This includes constructing and maintaining barricades, generators, and oxygen filters. Players will engage in combat against animated garbage threats with tools like turrets and flamethrowers.