To have a strong desire to do something.
A more vulgar synonym used today is "hard-on"
I had a rhoni for some pizza.
Major cleavage, like not just the crease, but to the point where not only is it almost busting out of a small shirt, but to where her bra looks as if it were struggling to support such delicate creatures.
Nipple Erections are a major plus
Jared, why were you staring at that chicks Rhoni?
Oh I see why!
Dude! those were like D's!