Top definition
A clontarf is a feminized liberal male douchebag; a know-it-all phloom who has to have the last word in every conversation; a guy who uses puns, big words, and trivia questions to show everyone how smart he is; a dick weed who always corrects your spelling. Like a black hole, he sucks all other conversation out of the room so that he can only hear himself talk.

See also phloom.
We were laughing our asses off until that clontarf showed up. Fuckin' phloom!
by Hafsemi Rafsanjani February 28, 2008
Get a clontarf mug for your girlfriend Larisa.
2
the best area in da whole of ireland, perfetly balanced, evry1 is stuk up ther own whole like in places such as blackrock and other posh areas but its not a big knacker hole like ballymun or finglas, etc.

its just rite best place 2 live EVER!!!!!!!!
clontarf is da best place in da world 2 live
by timmyotoole1 September 24, 2007
Get a clontarf mug for your coworker Trump.
3
A high-ranking Dutch wizard.
I haven't seen anyone as powerful as Dumbledore since the days of Clontarf.
by Blaggerz55 October 04, 2017
Get a Clontarf mug for your dad José.