Top Definition
A makeshift lubricant used for anul sex with a woman. The ingredients include dried up period blood, vaginal musus, spit, and fecal matter. Ideally this mixture is possible when having bareback vaginal intercourse with a woman during her menstrual cycle.
Sven didn't think he'd get his cock in Gina's ass but then he remembered he learned about rustolube in the boy scouts.
by tactrash May 14, 2008
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