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A stupid and incompetent person. Used when one wants to call someone a twat but is scared of offending them, so they mince their words and use this mild, but rather stupid, bit of slang. Occasionally used in Northern England, particularly Yorkshire and Lancashire.
"You thick twobble."
"What a stoopid fucking twobble."
"This school is full of twobbles."
by Lancashire Redneck November 17, 2004