To have an orgasm. The word 'rocks' can be compared to the testicles of the male, but the phrase also applies to females. See also bust a nut.
Man, that girl really gets my rocks off.
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The first thing i had to do was finger myself and get my rocks off before i got any more stressed
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reaching a sexual climax; sexual intercourse
I'm getting my rocks off with that man tonight.
I got my rocks off last night!
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