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1.
Usually a more pleasant way of saying "fuck all" or an alternative way of saying "nothing at all".

"Sweet FA" is an even lazier way of saying it.
PersonA: So, what have you done today?
PersonB: Sweet fanny adams, that's what.
by Kringlebeast March 11, 2008
 
2.
Another way of saying 'fuck all'
1: Have you done your maths homework?
2: Fanny Adams
by BettyTom October 30, 2007