1. To use one's penis to transmit diseases via sexual intercourse with multiple partners.
2. For an individual (particularly of the male sex) to seek sexual intercourse with disregard to one's self or another.
1.*"Hey, why is everyone angry at Todd?"
"Well, they found out he went around 'Zombie-Dicking' last night and now we've all gotta get checked."
"Goodness gracious... call the C.D.C."
2.*"I'm so worn out and my flesh hurts, man..."
"Maybe you should quit 'Zombie-Dicking' and get a hold of yourself before you catch an STD."
"I guess, bro-"
"Fuck you, Chad."