arse up

noun, verb — 2 senses

arse-up

nounalso spelled arse-up

1

Commonwealth, Ireland, UK, Slang, Vulgar A mistake or blunder; a cock-up.

arse up

verb

1

UK, Slang To mess up; to botch.

Take aim. Throw. If he arsed it up and made the creature angry – ha, well. He didn't look scared though.2011, Carol Birch, Jamrach's Menagerie, page 110:

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — authors: page histories for arse-up and arse up.