A phrase that can be used in many situations as an insult (interchangeable with the word stupid/retard) or to express pain.
Ex 1 (expression of pain): *stubs toes against table leg* "That's Fast!"
Ex 2 (insult): Ricky: "Girls who fart scare me more than death."
Me: "That's fast."
Ex 2 (insult): Ricky: "Girls who fart scare me more than death."
Me: "That's fast."
by dankboo November 27, 2018
Get the That's fast mug.