(as) useful as tits on a bull

(as) useful as tits on a bull

vulgar slang Utterly ineffectual, worthless, or unnecessary. Primarily heard in Australia. Hey, thanks for the broken wrench—it's as useful as tits on a bull. I know next to nothing about computers, so I'd be useful as tits on a bull trying to figure out what's wrong with your laptop.
See also: bull, on, tit, useful
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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