Corrupted Meggy is the original Meggy Spletzer kidnapped and experimented on by SMG4 during the "It's Gotta Be Perfect" arc.  She was experimented on in an attempt to turn her into a form that SMG4 calls "perfect."  This ended up giving Meggy a corrupted and distorted appearance.  Her headphones are now fused to her head and her original look's Inkling face marking is attempted to be recreated.  Her left eye has taken on a corrupt appearance and her right eye has become completely white.