1) description of a task that requeires (too) much effort to complete.
2) description of a customer who breaks your balls making you do whatever they want and still leaving unsatisfied.
" I was shagging that bird over from Hull last night, and it was only when i looked at her face i realised it was too much hard work. "
" Jesus, he was hard work. Comes in here, asks for a pizza, with a pasta bake for a topping and a tiramusu for a side. And this is a Fish & Chip shop! Twat.