1. An extremely annoying person that keeps coming back and annoying you after repeatedly telling them to leave you alone.
2. Anything that is annoying that keeps recurring or reappearing.
by Cannibus Indica April 13, 2004
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An annoying person who keeps popping up everywhere. Just when you think this person has dropped of the face of the earth, they show up. Similar when flushing a toilet, you walk away and notice the turd hasn't gone down all the way, requiring you to walk back, wait for the water to refill and reflush...
Man, that Mario Lopez from Saved By The Bell is a turd that won't flush. Just when I think his career is over, he jumps back into a made for tv movie.
by earn7 November 19, 2008
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“Like a turd that won't flush” can mean an excrement that you can‘t flush down the toilet. But when said to someone or about someone, it means an irritating person that just won’t go away.

It is mostly used in the latter sense.
Example 1:

He just keeps on bugging everyone and doesn’t know when to go away, like a turd that won't flush.

Example 2:

Guy 1: I don’t want him to come with us!

Guy 2: So why don’t we ignore him, and he might take the hint.

Guy 1: I doubt it, he’s like a turd that won't flush.
by scooby007 January 16, 2011
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