To describe a huge problem or 'cock-up' of gargantuan proportions.
Sean - "fook me did ya see the game last night?"
J-Blo -"Aye - what a bloody cock-a-thon that was!"
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The act of getting a friend of the opposite sex so plastered that they offer themselves to you in a most sexual way.
Sally - "Ooooh, I knew I shouldn't have had that 12th Bacardi Breezer - Steve totally mate-raped me afterwards"
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