A person or situation that looks like a fuck up from all possible angles.
Originally coined in S03E01 of The Thick of It:
Not only have you got a fucking bent husband and a fucking daughter that gets taken to school in a fucking sedan chair, you're also fucking mental. Jesus Christ, see you, you're a fucking omnishambles, that's what you are. You're like that coffee machine, you know: from bean to cup, you fuck up.
– Malcolm Tucker
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A description of something, be it an object, person, or state, that is in all ways a giant clusterfuck.
Steve Gorman made a right omnishambles of that base design.
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What are you too good for SNAFU now?
this world is in Omnishambles.
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a person who is not only a shambles in one single aspect but is in fact a shambles in all aspects of life
not only is her love life a mess but she just got fired, she's an omnishambles
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noun
informal•British
noun: omnishambles
1. a situation that has been comprehensively mismanaged, characterized by a string of blunders and miscalculations.
"anyone with five minutes to spare, a Maths GCSE, and a calculator could have averted the entire omnishambles by checking kirbie’s sums"