What a redheaded guy is if he calls his brunnette girlfriend a punk all of the time. It's not derogatory, just playful. The girlfriend just thinks of a word to call him back, and that's usually the first one.
Brunnette girlfriend - Oh it's pretty good. How about you, hooligan?
Redheaded guy - I'm not a hooligan.
Brunnette girlfriend - If I'm a punk, UD says you're a hooligan. =P