Originally from the 1984 movie 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).
look at this chud thinking he can save the world as a keyboard warrior all chuds are basically N******
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.