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.
A potent, sedative benzodiazepine (benzo). Used to treat anxiety and sometimes insomnia or restless leg syndrome. Similar to Xanax and Valium (same drug family).
Kpins are also used recreationally. The term "kpin" is typically only used in recreational circles.