A boy who has a animalistic and kinky mindset towards sex. Usually likes licking pussy, talking dirty and generally getting sweaty and messy with a girl. is happy to find like-minded dirty/filthy girls to lose inhibitions with.
'I got with Chris last week, he wanted to lick my hairy pussy... Dirty boy'
'Turns out Sam is a dirty boy, u should have seen the filth he was texting me'