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A Warrior. In Irish myth he was the dude who ran away with Fionn McCughall's wife. He was also good at climbing. Nowadays Diarmuids are generally of a good stock. Although often confused with the inferior anglo bastardisations of the proper name such as Dermot, Dermott and Diarmaid. Due to their relative rarity they tend to be unique, always quick witted, charming and easy going and It's probably worth noting that the name translates from the Gaelic as 'Without Fear or Envy'.

Noun: A sly motherfucker who'll wind you up and win your respect in the process with his acid tongue.
You better get offa my mother Diarmuid you crazy, charming bastard.
by reynard the fox March 11, 2011
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REALLY hot guy with a big dick, usually has freckles and brown hair.
Girl 1: DAMNNNN that guy's a Diarmuid
Girl 2: Yeah bet he's got a huge dick
by rtuhifbvducdh November 17, 2014
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A wizard/warrior who lives in a magical place called "Mordor" and sleep with a girl with big tits and who is a mothafuckin OG and smoke weed all day everyday.
I wish I was so Diarmuid right now
by Hamstertron 4000 March 09, 2015
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A man with floppy elegant hair who is very smart witted and has a friend called Bill and he has mental issues
"WOW look how he runs! He's a Diarmuid"
"Oh no he's become a Diarmuid"
by The Orwin slaver March 27, 2017
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