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1.
When a female licks a mans butthole while jerking him off into a pint of Guiness and then she chugs the beer.
Person 1: She was drinking more semen than Guiness after that Irish Reach-Around!

Person 2: At least that will wash down the taste of your butthole bro!
by Jawz CrankShoot July 25, 2012
 
2.
An Irish ReachAround is when doing someone from behind, you administer an object (usually a dildo) up your own anus.
John had all the fun last night, he gave himself and Irish ReachAround.
by frubly March 22, 2007