"Persassy" is a word created by the Percy Jackson fandom. It expresses how much sass the protagonist, Percy Jackson, has by literally including it in his name. It's used to describe how sassy and sarcastic one can be.
Percy: The ocean is too wet.
Whale: ...dude, are you high or something?
Percy: Nope, I'm just Persassy
a beautiful queen inside and out , she will always be there for you and always have your back , she’s loyal and will treat you like you’re the most important thing to her , if you have a persis in your life NEVER let her go , she’s too perfect to let go of , she has so many talents especially with music and you’ll be amazed by her abilities , she’s so amazing and unforgettable