What is Mater's full nickname in Pixar's Cars?

Mater's full nickname in Pixar's Cars is Tow Mater.

Mater is the rusty tow truck who becomes Lightning McQueen's closest friend in Radiator Springs. His name is a pun on “tow mater,” a pronunciation of “tomato,” while also describing his job as the town's tow truck. The joke fits the film's broader use of automotive language and regional speech.

The character is voiced by Larry the Cable Guy, whose Southern-style comedic delivery helped define Mater's enthusiastic, unpredictable personality. Mater introduces McQueen to Radiator Springs traditions, including tractor tipping, and remains loyal even when McQueen is impatient or dismissive.

In ordinary conversation, characters usually call him Mater, so viewers may remember only the shorter form. Tow Mater is the canonical nickname used in the film and in related Pixar material. He is not officially named “Tow Truck Mater”; “tow truck” describes his vehicle type, while Tow Mater is the character's wordplay-based name.