Definitions by BlackBlades

Nappy Rash 

The irritation or annoyance resulting from a relationship with a significantly younger partner.

Adam(26): I shagged that 19 year old chick the other night and now she won't stop texting me and stalking my facebook...
Joe(25): Sounds like you got a nasty case of nappy rash!

Nappy Rash by BlackBlades September 5, 2012