an expression of approval or an external compliment of something/someone. Used predominantly by females or homosexuals to express fondness. This phrase should never be said by a girl who is trying to impress a straight guy.
Justin Timberlake totally rocks my world, he is so hot. - My (ex)girlfriend.
A song that's so mid and sticks out in an artist's discography, but you enjoy it. You gaslit yourself into thinking it's good, and now you think it's amazing.
What is Taylor's Rock My World? Something that everyone hates, but you love?
Personally, I think Wax's best song is "Rock My World," but oh my God, it sucks.