Rock it 'til waterfalls
Rock it 'til waterfalls
Rock it 'til waterfalls
Bathe in these waterfalls

from Beyoncé – Rocket Lyrics on Rap Genius

Meaning

Rock'it is both an instruction for her lover to go hard and a play on the title Rocket.

The two (rockets and waterfalls) combine in this well written line to form a powerful sexual metaphor symbolizing the sensational rush of sex while embodying the appearance of the organs in question. There’s also allusions to the contrasts in sex ups and downs of sex, the heat and wetness.

Til water falls refers to climax or even female ejaculation.

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