Russian Gold

When performing analingus, or eating someone's asshole, Russian Gold refers to small amounts of fecal matter or shit that may be left on one's tounge. Stems from the food shortages in Russia during the revolutionary period when even shit was a precious food source. Usually taken in a negative light in most crowds

"Man, do hear about James?"
"No, what?"
"He likes Russian Gold."
"Eww, dude, that's gross"