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1.
The act of flatulating on a mans testicals during anal sex
john was enjoying anal sex with his girlfriend when she gave him a dundee fluffy
by Babos November 17, 2007
 
2.
When a man ejaculates in their partners anus and when the penis starts to become floppy, their partner farts and inflates the foreskin.
"John was doin his burd up the arse and when they finished she gave him a Dundee Fluffy"
by Andyrfc86 November 18, 2008