chonk up

English

Verb

chonk up (third-person singular simple present chonks up, present participle chonking up, simple past and past participle chonked up)

  1. (intransitive, Internet slang, especially of an animal) To become fat or large, especially from overeating or overfeeding.
    • 2023 February 27, daffodil0127, r/Feral_Cats[1], Reddit, archived from the original on 1 December 2024:
      My buddy has chonked up in the year and a half I’ve been feeding him.
    • 2024 June 20, kmrikkari, r/dechonkers[2], Reddit, archived from the original on 1 April 2025:
      No more free feeding for either of them, which is good because the void was also starting to chonk up.
    • 2024 July 19, corgisfirst, r/dechonkers[3], Reddit, archived from the original on 30 March 2025:
      Even still, I worry she's starting to chonk up.
    • 2024 November 11, nyatsomi, r/britishshorthair[4], Reddit, archived from the original on 30 March 2025:
      Some get chonkier after a while. I've seen bshs [British Shorthairs] who chonk up after they hit 1y, and some that need to hit 4y to reach the ultimate chonkiness level.
    • 2025 July 29, Aggravating-Can-945, r/britishshorthair[5], Reddit, archived from the original on 31 July 2025:
      Sebastian chonking up finally after two years.
    • 2025 August 10, ItsAllOneBigNote, r/catstairs[6], Reddit, archived from the original on 16 December 2025:
      I'm curious to hear how he sounds when he chonks up for the winter 🤣
  2. (transitive, Internet slang, especially of an animal) To make fat or large, especially by overfeeding.
    My neighbor has been chonking up her cat.