A "chud" is a penis that is fatter than it is long. In common usage, a chud can also refer to a penis that has equal circumference or greater compared to its length.
Chud is popularly used as a metaphor, to refer to any kind of fucking degen.
"That guy just got caught shoplifting, now he outside in handcuffs looking like a fucking chud LMAO"
"I'm not climbing onto that chud, I won't feel a thing" - your now ex-girlfriend