Originally from the 1984movie of the same name, stands for "Cannibalistic Humanoid Underground Dweller". Has now been turned into a racist expression by right wing circles to describe people of color (canibalistic humanoid) who fight for the Social Justice cause on the internet from what is assumed to be their parent's basement (underground dweller).
Chud: Chewing Gum.
Also used to describe something or someone as large, wide, massive, unmistakable.
Can be used as a compliment or an insult.
Also
Added syllables and words can colloquialise and reinforce the word; e.g chudders, chuddy, chuds.
"Alright Michael, you got any chuddy on you? You big chud"