Kahootenany: Reposting un-Snopesed silliness on the internet.
Kanoodledoodle: Whiling the hours away on sundry social media sites.
Kantankerosity: The inclination to argue about anything, to snark about everything.
Kavorked: To be on the receiving end of legalized euthanasia.
Keypal: An internet friend; a thoroughly modern version of the penpal.
Kidnapkining: Grabbing too many napkins at a fast-food restaurant.
Kultursmog: The smothering uniformity of pop culture's amoral morals.
Kwanhanamas: Kwanza plus Hanukkah plus Christmas; thus, the politically correct “Happy Kwanhanamas!”