It's a common meme format. Gonna try and word it in a way that I'm familiar with.

Basically, a person (a sojak-type character or wojak or whatever the fuck it's called) says to something, "Thank you for changing my life," stating that they enjoy the object or character in question.

The object or character then responds with some form of "I'm literally X". For example, Spongebob would respond with "I'm literally a sponge", and so on. Because y'know, it's ridiculous to love a sponge and Spongebob doesn't see anything fantastical about a person thinking he changed their life.

OP got the meme here half-right, but reworked the second half so it's not just "I'm literally a lobster". The lobster responds with "They used to serve me to prisoners" so the state would probably think "...oh".

Hopefully this clears things up some.