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8.
Adjective

Something that is just incredible, basically to good to be true, amazing, on. So good it's foul.
That was such a funny and foul kid.
That is a foul jacket, love it.
You're foul, the foulest person I've ever met, marry me!
by Cultured,whatofit September 09, 2010
 
9.
'Foul' can also be used as a positive adjective.
e.g.'Those trainers are totally foul, dude', meaning 'Those trainers are really rather cool'.
by Dave Davidson December 26, 2003