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1.
To finger the vaginal or anal cavity of a member of the opposite sex while they're sleeping.
1. Susie was asleep, so I Sneddoned that bitch good and hard!
2. Becareful, Jimmy might just Sneddon you.
by T3h_Aw3s0me November 05, 2006
 
2.
As in David Sneddon of UK Fame Academy ´fame´. A nasty rash that easily spreads in embarassing areas. See also diseased, plague, infection.
Ah man, I´ve got a seriously bad case of the Sneddon on my arse.
by Bitchwitch March 14, 2005