Unbumpable

To be near impossible to swindle, cheat or conned out of something financial. See noun 'bump' (London slang version)
To be savvy enough to avoid paying too much for an item(s) and or service(s)

They are trying to bump up the prices because we are tourists but they don't know I've been here eight times, I'm unbumpable

dolphin fingers

To be outstanding at something, nearly achieve your goal only to let it slip in a ridiculous way

The Arsenal team are good but watch how they flop by the end of this season, they got dolphin fingers for real!