User talk:2620:0:102F:17:B69D:3AA7:948B:DC0

I agree that the etymology of chunk+anus seems unlikely, but it's what what Dictionary.com says the coiner claims is the origin:

"Chungus is credited gaming critic Jim Sterling. Sterling is said to have coined the word in 2012 as a blend of “chunky anus,” apparently used as an intentionally juvenile insult."

https://www.dictionary.com/e/slang/chungus/ 2620:0:102F:17:B69D:3AA7:948B:DC0 22:44, 16 October 2019 (UTC)