No there's just one, one, one
No baby just one, one
I bet you wanna know

from Rihanna – You Da One Lyrics on Rap Genius

Meaning

Uh-oh, looks like he may not be “one-of-a-kind” like she was saying. She basically lets him know that someone other than him has made her happy, without revealing the person’s identity. Then she goes on to tease the poor guy.. (“I know something you don’t know” type of deal)

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