A Mime is a street performer who acts out stories through body motions without speaking. Miming is all about physical movement and exaggerating your expressions. Mimes must use their actions to send a message or tell a story. They are not allowed to speak directly to the audience.
There was a mime performing in Danville Park. He was performing for two people when he is run down by Candace in an ice cream cart. There are also two juggling mimes that control Doofenshmirtz's alligator.
In Picture This, after a mime makes fun of him in the park, Doofenshmirtz creates the Mime-inator and traps all the mimes in the tri-state area in invisible boxes.