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When someone has a complete lack of coherence, system, or central guidence in life.
Matt forgot to buy cutlery when he moved into his new house, what a Hanlan thing to do.
by Dutchbutler February 21, 2018
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Hanlan is a Gaelic/Irish name derived from O'Hanluain. It is typically given to blonde females with radiant smiles. The name Hanlan traditionally means Hero, Warrior, Champion.
That girl's smile is beautiful, She looks like a Hanlan
by windmill230 August 29, 2018
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A complete clown.

Not in the funny sense, but just that they are really shite at everything they do. Also known as a "fucking muppet"
The guy is having a Hanlan, you really gotta feel sorry for him!
by M W L September 12, 2007
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