One with great wit and ability when it comes to use of the tongue. (Also known as oral sex). It is derived from "cunning linguist" with the first letters switched around. Much like "bucking fitch" and "fothe mucker". It was first used on Facebook when someone mistook "cunning linguist" for "lunning cinguist". Its meaning is the reverse of cunning linguist. The person in question has sloppy techniques with their tongue, hence the miss speaking of words as well as implying lack of skill with oral sex. Two lunning cinguist performing 69 is sometimes called lunning cinguists.
David: "Ya mother is a cunning linguist!"
Rachael: "Don't you mean "lunning cinguist"
by Tony Young September 5, 2011
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Being fed up with how your life goes and wanting to change, but being lazy at the same time and not being able to change.
Person 1: You got to get your shit together in life man!

Person 2: Yeah I know, but I am so Lun I don’t know what to do!
by SHEIJH_ZERO May 24, 2023
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The best person in the world super hot and emo. Is trying her hardest to get over a guy that doesn’t deserve her. Smart, beauty and bad bitch forever.
Omg she’s such a lun.”
by Subdkendie November 6, 2021
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lun
wow lun
by sir riz July 25, 2022
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