I'm-a lean back
Don't worry it's nothing major
Make sure you clean that
It's the only way to get the
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from Beyoncé – Blow Lyrics on Rap Genius

Meaning

Well, ain’t she a freaky girl? She’s going to lean back and let Master-Z do his thang!

When she leans back she warns him to not be worried, because she is ready to lose herself.

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