When the male recipient of oral sex punches the giver on top of the head, just before ejaculation resulting in a bite down just as orgasm is reached, frequently incurring mild genital injury or bite marks (like a snake bite).
"Wow, look at these marks I got on my dick last night when I viperpunched that girl from the club!"
by DontViperPunchMe November 23, 2011

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