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1.
Derived from the suburbs of a town called Moseley, in England UK; bum stung often refers to something amazing or really good. Other uses include to reflect happiness in mood or to say how good-looking a particular female is.
"Mate, check her out."

"Yeah she's properly bum stung."

"Trust!"
by drivenamo July 23, 2008
 
2.
1. The slang reffering to contracting a sexual transmitted dessease through anal-sex

"Don't mess with her man she got bum stung by the Herps"
by Toaden Kay February 11, 2009