Used to emphasise that something is to the extreme; 'you have no idea how...', 'it's incredibly...'.
Verb-casual + といったらありゃしない, い-Adjective + といったらありゃしない, な-Adjective + だといったらありゃしない, Noun + だといったらありゃしない
Long explanation:
The ~といったらありゃしない grammar point is used when emphasising that something is so extremely a certain way, it's hard to comprehend. It can be loosely translated as 'you have no idea how...' or 'it's incredibly...' in English. This is an idiomatic expression and does not get directly translated.