I've never heard it. Bear in mind that ass is NOT a rude word, it's another word for donkey and a sily-ass is an upper class twit. I've never heard the UK equivalent expression hard-arse (can I say that?) used either.

"Little Hitler" or "Jobsworth" are used to describe people who apply rules rigidly. The first is obvious, the second possibly less so. "It's more that my job's worth to let you park there mate."

Neil