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A face so full of rage and grossness it could scare a ghost; usually ends with a loud "aw $h1t" or a scream of "What the fu*#?"
Your cousin dropped a whole plate of spaghetti on your brand new shoes. You did the mad muggin’ so hard the ceiling cracked.
Your dog ate your mom’s favorite hat. You did the mad muggin’ so loud the neighbors called the cops.
Your friend told your crush you were a total loser. You did the mad muggin’ so fierce it made your friend cry.