Slackjaw is one of enemies from the hit game AntonBlast. It's a really giant koi fish with small beady eyes and rusty beartrap serving as its mouth. It's colored white with orange blots, one prominient one shaped like a skull. It appears in the level titled Mysterious Glasshouse, more specifically in the dark underwater section where it follows player and charges at them while trying to take a bite or eat them. It cannot be killed, but can get stunned after bumping into wall.