as rough as old dog's tits

means its old rough and not pleasant to look at/ feel

That old lady wearing a mini skirt looks as rough as old dog's tits.

or

After 20 tequila shots I feel as rough as old dog's tits.

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rough as old dogs tits

when someone looks worse for wear, rough looking, usually older women trying to look younger than they are.

Look at that old woman dressed like a teenager, she looks as rough as old dogs tits!

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