Previously an adjective that now is a verb. It is the new way to describe making out or hooking up, even canoodling without being too obvious about it. It never goes farther than second base. Usually persnickety happens on a one time basis or with someone you aren't that interested in. It also means to canoodle, or to spoon and kiss etc.
Alanna and David just persnicketied behind the bleachers at the football game.
Damn it! I really want to persnickety with him, but I don't want to make the first move.