Top Definition
generally Irish, normally vein, pale tries to use sunbeds, bumder, great in bed (not all the time - rarely actually), small penis, big feet, generally looks like a lepruchan, huge vagina, loves to do the irish jig, likes to make 'friends', often falls easily in love with girls beggining with K or C
Wow she's got a huge O'Mahony!

Stop being such a hell mary O'Mahony - how embarassing!
by kvcelovesohmyhoney April 29, 2009

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