Small, balled up pieces of semen that collect in the pubes of lovers, post-coitus. These balls are often wiped away with a cum rag, but are sometimes collected in Altoids boxes and catalogued for posterity.
"Man, that chick Suzy started to eat my rivlets like mad but I stopped her so I could sling them into my rivlet satchel so as to remember the hot anal we had."
by DoomBot April 08, 2004
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