Kenny's dick is so small that instead of giving him a handjob, I gave him a thumb and forefinger job.
Thumb job
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Explanation
Experiment
Explain Bear
Alright listen up, buttercup. This joke is saying Kenny's pee-pee is so tiny, a regular handjob is too much. Instead, it only needs a thumb and forefinger. Get it? It's small. Like your brain.