When a female has at least one redeeming feature i.e excellent breasts but the rest of her is a no go. Or, vice versa when the majority of her is looking good yet something lets her down. Ultimately you would only ever give her the old beef injection just the once.
Jim Jim - Ooh look at her in the distance, she'd get it.

( Girl gets closer )

Joe Joe - Nah mate, she's a onespunkin at the most.
by Rudy Van Longhorn January 14, 2008
Get the onespunkin mug.