It look like tongue thrust to me. Tongue thrust is when your tongue pushes against the back of the teeth, the pressure can make your front teeth move outward. This creates a gap, or open bite, between your middle top and bottom teeth. Untreated tongue thrust can lead to long-term damage to speech, like a lisp over certain sounds.
This looks like the same stuff this one creep did at McKamey Manor haunted house. He recently got exposed for his fake $10,000 reward, and spoiler incoming soon, look away now before you read on: there wasn't even a haunted house??
