Generally occurs only after you've already pissed in it.
Its bad when it happens in your own toilet - Its worse when it happens in a public one.
Chubbs:Alright, have fun, and watch out for the splashback!
2. (metaphorical) unforeseen, unintentional, negative consequences of a person's actions.
2. Neil realised he had incurred splashback when he recognised his girlfriend's mother as the older woman he had picked up while drunk the previous weekend.