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1.
To defaecate, usually making a curly shaped faeces.
On a Sunday morning I love to curl one out whilst reading the papers.
by BanusAnimal July 26, 2008
 
2.
The act of excreting.
- I'm off to the shitters, i need to curl one out
- Oh my god, did you see the poo button, that was sick how he curled out on her chest
by Barclay teh great October 20, 2008