A euphemism for someone’s arse, posterior, anus, or shitter. Popular amongst the armed forces deployed to sort out the whole collapse of Yugoslavia schemozzle. (See also Garry Glitter)
She totally pegged him, took him right up the Balkan Retreat.

So I said to him for your birthday we’re doing something special, you can enter my Balkan Retreat.
by The Big Effin’ Gee May 12, 2021
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