Derived from Jonas. Describing something, well, Jonas Brothers-ish. Being, "fancy", "fruity", or, when all else fails, gay. Also pertaining to anything very childish or overrated. A waste.
The new girl was a joney. She wore pink and had pigtails. She wore Disney Princess t-shirts and Sketchers.
The new guy was a joney. He wore a rainbow t-shirt on his first day and listens to Madonna.