Verb: to motorboat someone's ball sac as though it were a woman's cleavage. Scrotorboating is not exclusive to the nuts, and can even include said activity on someone's taint.
"Please just go down on me. When you scrotorboat me, it tickles and I lose focus!"
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Noun; the erect penis when used mainly for taunting, especially when rubbed against ticklish anatomy including armpits, ear lobes and genitalia
"I'm listening, Mom. He just keeps poking me with his tickle sword!"