A racist slang term. A variation of felching, in which the man retains the semen in his mouth, then transfers it to the woman's mouth. She then swallows the mixture of saliva, semen, and anal fluid.
Origin: the idea that the Irish will eat anything when drunk, and that Irish women always do what their men tell them to do.
She's so sick, she begs guys to do the dirty irishman with her until she pukes up crap and cum.