If I toot it leave it, tooted up
Then I drop it, drop it
'Til ya making faces
Lookin' like you want to
Tell me stop it

from Rihanna – Watch N Learn Lyrics on Rap Genius

Meaning

If she does all of these tricks to make her man, his face will change numerous times especially while she is giving him head. She says the pressure that is building up in him is so strong that his facial expressions looks like he wants to tell her stop, though he won’t.

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