bob: so what's she like? john: great personality, but she's got a head like a bashed crab
"a physically ugly/unattractive person likened to the sometimes messy aftermath of cracking open the shell of a freshly cooked "muddie" ([mud crab] for the un-australianised)
"bob: so what's she like? john: great personality, but she's got a head like a bashed crab" What is the definition of "bashed crab"?