Shiny, flaky (crusty) dried up spunk residue left over on clothing apparel after fully clothed sex and or masturbation.
Brandon went over to his parents house for dinner after having sex in the car with his lady. Upon entering the home, not only did his smile give him away, but so did the mermaid scales located in the groin of his pants.
Marc: "Damn dude whats that on your pants?"
Brandon: "Aww shit" (trying to scratch off the scales to avoid embrassement) "Fucking mermaid scales!"