To do a jono is the act of rejecting your current company to maneuver, in a stalking fashion, over to a person of the opposite sex. Doing a Jono usually consists of a male, staring longingly at a female's chest area. This act if performed subconsciously and usually leaves the former company of the "Jonoer" feeling annoyed. Two people can subconsciously do a jono together, which is known as in the trade, Dual Jonoing.
Sarah: "(oh god, hes doing a jono again, i wish he'd leave me alone)"
Phil: "Oh, theres goes Jono on another tit rampage"
Bob: "Ah man, just leave her alone!!"
Jonoer: "breasts? breast breasts breasts breasts! hmph... breast!"