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(as) useless as tits on a nun

vulgar slang Ineffectual; pointless. Hey, thanks for the broken wrench—it's as useless as tits on a nun.
See also: nun, on, tit, useless

Covent Garden nun

obsolete A promiscuous woman, often a prostitute. Those Covent Garden nuns will have nowhere to turn when they're released, so they'll most likely will end up back on the streets again. Someone needs to tell young Reginald that a woman with a reputation as a Covent Garden nun has no place being brought into this celebrated family.
See also: Covent, garden, nun
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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