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Looks like it's mostly Bing. First five results for 'big chungus':

Google:

- dictionary.com

- knowyourmeme

- artsatmichigan.umich.edu

- urbandictionary

- thetab

Bing:

- knowyourmeme

- silvergames

- wikipedia

- urbandictionary

- joke battles wikia

Lycos:

- knowyourmeme

- urbandictionary

- silvergames

- youtube (BIG CHUNGUS | Official Main Theme | Song by Endigo) [this is the sixth result on Bing]

- joke battles wikia

Yandex:

- big chungus wiki

- youtube: big chungus (song)

- knowyourmeme

- memepedia.ru

- urbandictionary