noun; A contraction of shrub (as in bush, slang for female pubic hair) and stubble. Shrubble describes the unsightly remnants of inadequately-trimmed pubic hair that extends past the boundaries of a swimsuit along the bikini line, such that it is visible to the casual observer.
Also; shrubble-trouble: The condition of being afflicted with shrubble.
"I had better get a Brazilian wax so I don't have shrubble when I go to the beach saturday."
"Damn, that girl got shrubble-trouble, she'd better go home and take care of that."