You rock my world - when a guys says this what does it mean?

Anonymous
guy friend has been what seems to be flirting on and off for a while then out of the blue during a mindless convo he says to me "you rock my world". what is he trying to say? if he likes me, he hasn't asked me out. and since I didn't know what he wanted cos he's always flirting around, I didn't take him seriously so didn't say anything back. now he plays me hot and cold and I hate it.
You rock my world - when a guys says this what does it mean?
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