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When a disgusting Irishman swabs his bellybutton with his finger, then wipes it on an unsuspecting innocent bystanders upper lip.
Jim got a dirty irish milkbone from kirk.
When A Irishman that hasn't bathed in days swirls his finger in his bellybutton, then wipes his finger upon a lip of an unsuspecting innocent bystander.
Jim got a dirty irish milkbone.
Noun (N).
Referring to the index finger of an uncouth Irishman.
"Get your dirty Irish milkbone out of my face man!"