This is typically used when someone crashes hard, specifically, on their face.

To snitch on

To turn or tell on someone for doing something wrong.

To run to someone in authority and tell them about someone else's misbehavior. Tattling, snitching.

where u stick a slice of cheese in a ass and eat it

to give oral sex to a female

Orangutans who originate from the Borneo and Sumatra rainforest, tend to have a sweat build up under their arm pits. This sweat build up forms a yellowish color and resembles the consistency of cheese. When telling someone to “eat cheese”, one can only infer that it is an insult of the greatest degree!