Ug-ug is a term used to describe someone, who is usually not only ugly, but dumb as well. This is because of the comical caveman sound effect "Ugh-ugh".
Tom: Hey, Sally! Did you see the new girl at school today?
Sally: Yeah, that bitch was super ug-ug!
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a man who is enjoys sexualt intercorse with kids of all genders
nissen: did you hear about bb ug ug monke
KB: yea he raped those kids while saying ug ug monke
nissen: yea famalam