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1.
An expression of disbelief, often in a disgusted or disdainful context. Analogous to "yeah, right" or "as if!"
A: Vanilla Ice was the greatest rapper of all time.
B: Aplenty!

or

A: That girl was eyein' me in the club.
B: Yeah, she was eyein' you aplenty.
by mkstyles August 09, 2006