Relating to the underworld or the god Pluto. Common misspelling of the word platonic, meaning intimate and affectionate but not sexual.

A pun that indicates a relationship that is not only not platonic, but explosive.

a friendship or relationship in which there is no possibility of romantic progress.

Adj: A one-sided relationship that not only fails to ever get romantic, but that manages to get you publicly humiliated in front of your peers when the object of your affections openly dates someone else.

from: "platonic" and the demotion of Pluto to dwarf planet status.

A penatration-based sex act so warped and craven that it is "of Pluto", i.e. beyond anal. Although "plutonic" does not refer to any specific act, it could include such acts as ear sex, removing someone's glass eye and having sex with the empty eyesocket, sex with a colostomy stoma, an esophagal stoma, or stab wound.

A non-sexual relationship between a man and a woman that could /should only work in outer space.

A relationship that was formerly sexual in nature, but has been demoted to "just friends."