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1.
Verb. To place one's testicles into the anus of oneself or another.
If Bill at one point places his testicles into Jane's anus, he may say to her "I am rimrocking you," or he may later go on to say "I sure rimrocked Jane."
by Travis October 31, 2004
 
2.
When someone has crazy, hard, pertruding anal intercourse. So hard that it it makes not only the males dick hard but the female's anal cavity.
Sean went over to Alex's and Art was in Alex's bed Rim Rockin' Emily. That fuckin' whore loves to get her rim rocked.