Originating from an episode of the Simpsons (episode 2F19 "The PTA Disbands")
It has taken on a comical nonsensical interjectional use... appropriate as comic relief or as a tension breaker
-'Jeezus!! who the hell ate the last jos louis?'
- 'purple monkeydishwasher?'
When two people are getting action and one person takes a jar of jelly and dumps the jelly in the asshole and slurps it out. Common for both straight and gay couples
Tom: Did you have fun last night?
Ben: I purple slurpled that shit up! I love blueberry jelly!
This is a coined phrase from CU-BoulderChey-Ho. It is meant to be used in a sarcastic tone. Purple Dick--->Someone who is a bit tarded, annoying, or an asswhole. But can be used in anyway.