i'll bare my arse in fenwicks' window
if sunderland finish above newcastle in the league, i'll bare my arse in fenwicks' window
a saying from tyneside (in the north east of england), used when expressing absolute confidence that something will not happen
"if sunderland finish above newcastle in the league, i'll bare my arse in fenwicks' window" What is the definition of "i'll bare my arse in fenwicks' window"?