What is a Ford Mustang fastback 2 2?

There's no official Ford Mustang model designated as a "Fastback 2+2". Ford has used "fastback" to describe the roofline style of various Mustang models over the years, and "2+2" usually refers to seating (two front seats and a small back seat, typically cramped).

It's likely you're encountering this term in an informal context, possibly referring to:

* A specific year and trim of a Mustang with a fastback body style and four seats. Someone might use "2+2" colloquially to specify the four-seat configuration of a fastback Mustang, even though that wasn't Ford's official designation. To know what car it is, you'd need more details (like the year).

* A custom or modified Mustang: Someone might use this term to describe a customized Mustang with a fastback body and four seats, even if it wasn't originally a factory 2+2 configuration.

* A misremembered or inaccurate description: The term might simply be incorrect.

To identify the specific Mustang you're interested in, providing more information such as the year, generation, or any other details would be helpful.