A term popularly used by inbreds and substandard musicians who are incapable of correctly spelling the word 'polish'.
'Let's be honest. you just can't ploish a turd, can you?'
In this example, the user has attempted to insult the quality of someone else's endeavours. However, due to the user's poor understanding of the English language, the insult has backfired and made him look like a buffoon.