It is the best comeback ever, and can be used in response to anything. It will work on anyone, but some may be extremely offended, annoyed, or entertained. It should be either used with utmost caution or constantly. It is a very powerful weapon it could even start wars. (That's how Star Wars started) It also works better than "Your Mom!".
It can be used when overhearing someone.
Person 1: Man, that car was the stupidest thing I've ever seen
Person 2: Your Face is the stupidest thing I've ever seen!
Or when being insulted
Person 1: Your stupid.
Person 2: Your face is stupid!
Or use for a set up
Person 1: That's a dumb tree
Person 2: Your face is a dumb tree!
Person 1: That doesn't make sense.
Person 2: Your face doesn't make sense!
Or when you can't think of something to respond with
Person 1: What are you doin' today?
Person 2: Your face!
Person 1: That doesn't work!
Person 2: Your face doesn't work!
Person 3: Ohhh! Sick burn!
Person 1: Oh come on!
Person 1: Man, that car was the stupidest thing I've ever seen
Person 2: Your Face is the stupidest thing I've ever seen!
Or when being insulted
Person 1: Your stupid.
Person 2: Your face is stupid!
Or use for a set up
Person 1: That's a dumb tree
Person 2: Your face is a dumb tree!
Person 1: That doesn't make sense.
Person 2: Your face doesn't make sense!
Or when you can't think of something to respond with
Person 1: What are you doin' today?
Person 2: Your face!
Person 1: That doesn't work!
Person 2: Your face doesn't work!
Person 3: Ohhh! Sick burn!
Person 1: Oh come on!
by Mr. Know It All (Seriously) February 22, 2019
Get the Your Facemug. 
by Lekdog June 1, 2022
Get the Your matemug. 