A friend of the opposite sex (often a stripper or lion tamer but not a prerequisite) who is quite expensive to get to know. Not to be confused at all with a platonic friend, who is a friend of the opposite sex with no attractions to one another.
At present there is only one documented case of a plotnic friendship. More research needs to be done to give examples.
The Urban Dictionary Mug
One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.
Buy the mug