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.
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.