Similar to "Walk it off."
An appropriate response when conversing with sexually frustrated individuals who have no future mating prospects.
James: "Dayum! I'm horny and no girl will sleep with me. Not even Gretta, the unibrow girl."
Morty: "Whack it off, James... Just whack it off."
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Declining a request or proposition without a reasonable cause and the sole intention of being a dick.
"Mark, can you hand me the ketchup?"
"Afraid not, Johnny boy."
"Man. Way to dickline."
"Melanie, could you keep it down please? I have an important test tomorrow."
"I'm going to have to dickline on that one."