Having high resistance to flow. In other terms, the more dense the thicker the consistency. Is meant to be applied to asses of substantial dimensions.
Damn baby, you viscous!
Kim Kardashian's sweet ass has the viscosity of a generous dose of corn syrup unlike Paris Hilton's ass that is just like a teaspoon of water.
A Fecal turd with high levels of viscosity. A turd that is physically maintained within the occurrence of Diarrhea or a loose bowel movement. Liquid, wet poop.
Fuck him man! Don't let him disrespect you like that! You better leave some viscous biscuits in his fucking pillow case tonight!