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1.
UK regional term for underpants, believed to have originated in Derbyshire.
That fartarse has smelly gadders.
by VinceSheen March 12, 2011
 
2.
A local term for a woman genitals, though often also included the goochand ass/ japflag.
After last night my gadder hurts like hell

Jesus bitch your gadder is kicking out a right stink.
by SteveP February 22, 2006