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'
by Ktbonline June 15, 2013
A sexually frustrated young man, who fulfills fantasies of flirting with, fooling around with, and/or sleeping with, dirty girls. (see definition of "dirty girl")

A boy who is ridiculously amazing in bed.
damn, jeff is such a dirty boy.
by a Dirty Girl February 09, 2009

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