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1.
A slang term for anal sex. Taken from ex-Liverpool and England Footballer John Barnes who for the Official England 1982 World Cup anthem with New Order performed a rap which said "to unlock the defence you have to get round the back"

Alright dude went out on a date last night. You never guess what? Only went back to her's and she let me barnesy her.
by Alex John Cook March 07, 2007
 
2.
a slang term for anal sex. Taken from ex Liverpool and England Footballer John Barnes who for the Official England 1982 World Cup athem with New order performed a rap which said "to unlock the defence you have to get round the back"
Alright dude went out on a date last night. You never guess what? Only went back to her's and she let me barnesy her.
by Alex John Cook March 05, 2007