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1.
A man of Irish birth or ancestry.

Also a man that can drink any man under the table and can take on any fight. He's also loyal to the end and is always there for his mates. If you find one in a bar be sure to buy him a drink for he'll have some stories that will make yer hair curl!
Look at that Irishman drink!
by jack_dan February 02, 2010
 
2.
A filter into which Guinness is poured in order to produce light beer.
This beer tastes like it was filtered through an Irishman!
by TheOregonian1234 June 25, 2011