It looks like you're using a substitution cipher, specifically a letter substitution where each letter is replaced by a different letter a fixed number of positions down the alphabet.
However, I'm guessing that might not be the intended message. rabt thmyl bwt fry fayr
"About them lab fry day"
"RABT THMYL BWT FRY FAYR"
I see you're trying to communicate in a coded way! It looks like you're using a substitution cipher,
If I decode the message "rabt thmyl bwt fry fayr" using a simple Caesar cipher, I get: I get: becomes:
becomes: