Either, a sexy girl whose face you'd love to spunk over or a sexy boy who you would let spunk on your face.
Either way it is a phrase used when you fancy someone that you see out.
'He is a real spunk-face'
I'd love to spunk on her face
I'd let him spunk on my face
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A face (preferably a female's) covered in a man's baby gravy after having sex or after getting head.
She gave me head and when I nutted I left her with a Spunk face.
After getting head from that chick, I left Spunk on her face.
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