chonk up

chonk up verb: to become fat or large, especially from overeating or overfeeding.

Verb

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

(Internet, especially, intransitive) To become fat or large, especially from overeating or overfeeding.
- My buddy has chonked up in the year and a half I’ve been feeding him.2023 February 27, daffodil0127, r/Feral_Cats, Reddit, archived from the original on 01 Dec 2024
- No more free feeding for either of them, which is good because the void was also starting to chonk up.2024 June 20, kmrikkari, r/dechonkers, Reddit, archived from the original on 01 Apr 2025
(Internet, especially, transitive) To make fat or large, especially by overfeeding.
- My neighbor has been chonking up her cat.

Even still, I worry she's starting to chonk up.2024 July 19, corgisfirst, r/dechonkers, Reddit, archived from the original on 30 Mar 2025:
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.2024 November 11, nyatsomi, r/britishshorthair, Reddit, archived from the original on 30 Mar 2025:

third-person singular present	chonks up
present participle	chonking up
past participle	chonked up
past	chonked up

What does chonk up mean?: Chonk up means to become fat or large, especially from overeating or overfeeding.
How do you use chonk up in a sentence?: Even still, I worry she's starting to chonk up.
What part of speech is chonk up?: Chonk up is a verb.
What is the past tense of chonk up?: The past tense of chonk up is chonked up.

Adapted from Wiktionary: chonk up (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

Last updated: 2026-09-02

Cite this entry: “chonk up.” Word.ws, https://word.ws/chonk_up. Based on Wiktionary, CC BY-SA 4.0.