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3.
a mild affectionate insult, someone who is both a plonker and a loon at the same time.
Friend 1:" do you want half towards the price of the curry we had tonight?"
Friend 2 :"NO MATE! stop being daft you ploon"
by roquers July 01, 2011
 
1.
The disctinctive purple vagina of a black female. Derived from the purple colour of a plum and the word poon.
I entered an ebony porn site looking for poon, but I only found ploon.
by Fernando Leon September 24, 2008
 
2.
Is the pubic hair left on a toilet seat. It is stringy, black and stuck on.
There is ploon on that toilet seat
by Peter Santafe January 08, 2005
 
4.
Someone who is usually fairly intelligent but does something moronic or out of character would be a ploon.
Ryan thought the time was 3am because the clock stopped working even though it was still sunny, what a ploon.
by Mancazza March 18, 2011