The full name is "heterodox interrogation society FFF group", originally from the animation "Idiot, Test, Call Animals". It is a group aiming at "burning heresy-heterosexuality" (which can be understood here as the hostility of men without girlfriends to men with girlfriends). The main slogan is "burn!" .

Later, it was widely used as funny and self-deprecating among otaku and pseudo-otaku as the main audience of "Stupid Test Summoning Animals" (mainly concentrated in Acfun, Bili Bili and other animation barrage and post bar forum websites).

References:

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Animation Dongdong team at your service.