as common as muck

as common as muck

Low-class. Primarily heard in UK, Australia. Considering she's wearing an outfit like that in public, she must be as common as muck.
See also: common, muck

as common as muck

  (British & Australian informal)
an impolite way of describing someone who is from a low social class You can tell from the way she talks she's as common as muck.
See also: common, muck
References in periodicals archive ?
It means no class, someone who is as common as muck.
Mel B is talentless, has a mouth the size of the Mersey Tunnel, knows nothing about acting and is as common as muck.
Lady V on the other hand may have had a privileged upbringing but she's as common as muck.
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