I will start:
'Going to the knackers' - means going to the slaughter house. Used like this: 'Our party went to the knackers last night when a riot broke out over the keg running out'
'Knackers' - another term for testicles, used like this 'John was really disappointed when that rugby ball hit him in the knackers'
(Southern Hemisphere - Australian OR Kiwi)