Definition of chonk:
(n) :
(slang, chiefly Internet slang) An adorably fat or large creature, particularly a cat.
(adj) :
(slang, chiefly Internet slang, of an animal) Adorably fat or large.
(v) :
Synonym of chonk up.
(n) :
Alternative form of chank (“type of shell”). [(India) The large spiral shell of several species of sea conch, much used in making bangles, especially Turbinella pyrum.]