1. noun - a person who is so narcissistic that, if it were possible, would have sexual intercourse with themselves
2. verb - selfpenetrating - the act of being overly and unnecessarily narcissistic
1. (noun) Ronnie, who kisses his reflection in the mirror every morning after he dresses, is a complete selfpenetrator.
2. (verb.) Jenny is in the girls bathroom gazing at herself in the mirror, flipping her hair and puckering her lips and is other words selfpenetrating.