Small particles of shit that are expelled during a fart, often pebbledashing the perpetrator's underclothes with small brown flecks. Most commonly experienced by women, and men that for some reason find value in waxing/shaving thier arseholes.
"Mate, I finally nailed that Jenny bird last night"
"Yeah? How was it."
"She was a right dirty bitch. In more ways than one. I woke up this morning and saw her dirty, farticle-flecked panties strewn over the floor. Never take a bird for a curry if the sight of fine sprayed shit in the gusset offends you."