USP-S | Monster Mashup by Nextgenz appeared in CS:GO on December 3, 2020. The skin belongs to the Operation Broken Fang Case that was added to the shooter along with the corresponding operation.

The design of the weapon is graffiti-inspired, featuring a drawing of a cartoon-style green creature on the slide and grip, with the gun's trigger serving as its tongue. The silencer is adorned with a bright green outline of a robot's head, along with various other heads and faces in lighter shades.

Float Value of USP-S | Monster Mashup can vary between 0.00 and 0.70, allowing the skin to be obtainable in any exterior quality category. As the float value increases, the weapon gradually darkens and loses its paint, especially from the edges. With heavy wear, almost all the paint is removed, yet the creature's teeth and tongue remain discernible.

USP-S | Monster Mashup belongs to the “Classified” rarity grade and is available with the StatTrak kill counter. The skin is moderately popular among CS2 players.