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When you fake a cumshot while pretending to be doing something else, but you're really just getting off on your own dumbness.
'I was multitasking, bro. I was working and jackturbating at the same time.'
'I tried to text my girlfriend, but I was too busy jackturbating in the bathroom.'
'I said I was doing my homework, but I was really jackturbating on my phone.'