An Evening Damage is a very large shit you have after you've had your tea (or dinner/supper depending where in the country you're from!). It is generally one that's hard to squeeze out, but when it does, it makes a very heavy plop as it enters the water.
FRED: I'm just off to the toilette to offload my evening damage.
JOEY: OK have a good one!
drop the kids off at the pool restock the lake with brown trout lay a cable build a log cabin