Noun: an insignificant, loud-mouth, jerk-off who totally fucks himself over every time he opens his big fucking mouth. To be more specific, someone who repeatedly slaps themselves in their own face with their own proverbial cock while at the same time ejaculating into their own eye socket, causing irritation not only to themselves, but also to everyone around them as well.
Example 1: "Don't be a dick mouth!"
Example 2: "What a dick mouth!"
Example 3: "Congratulations-you are not only stupid, but are also the king of all dick mouths!"