Baby I know you can feel it pulse
Keeping the peak of my waterfall
Rock it baby, rock it baby, rock it 'til the water falls
Damn

from Beyoncé – Rocket Lyrics on Rap Genius

Meaning

She is referring to her partner feeling the inner muscles contracting during orgasm. She then says: “Keeping the peak of my waterfall” — this goes along with the sensation a woman gets during orgasm. The sensation just keeps going if he doesn’t stop. She has also already orgasmed and he just keeps delivering.

Note how she replaces the word waterfalls with the words “water falls”. She wants him to keep going until the ‘water falls’.

She may be referring to a more literal “pulse” — the pulsating movements/muscle contractions a woman’s vagina makes when she’s hotting orgasm. That also goes along with the “keeping the peak of my waterfall” (when she finally reaches orgasm, the “peak”) and the “rock it ‘til the water falls”, or until she ejaculates. But even women who don’t ejaculate often release a rush of fluid when they orgasm.

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