Top Definition
In Devon (West of England), an idle, slow and incompetent person who is no use to man nor beast. Just like a slack fanny (whether British or American), someone who does a poor job of whatever they are meant to be doing.
'That Pete's such a slack fanny. Three bloody years I've been waiting for him to look at my roof.'
#lazy #slack #feckless #slow #with you presently
by mockschmock December 07, 2006
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