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a stubborn, dense, or otherwise thickheaded Irishman or person of Irish descent.
I was a stubborn toddler; Grandpa would try to get me to wash my hands before dinner, but I would hands had not dirt on them, why wash?

"Jesus Christ, you are one thick mick, ya know that?" queried a frustrated Grandpa.

(aye, this is how grandpa spoke to toddlers)
by ThickMick October 17, 2010
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