A very small piece of matter you find on surfaces and floors. Could be food, fuzzies, dirt, etc...
Leonard, why do you have a bunch of k'nibbles laying in your bed and on the floor??
Chewing with your mouth wide open, smacking your lips while eating something
Shaniqua, stop kanutching on that Italian sausage!
Two individuals (or more) who are related that participate in sexual activity together.
Bernard: Did yall hear about Beatrice and Benny? They were at the family reunion making out!
Billy: Sick Bastards! They're kissin cousins!