My ex-boyfriend's dick is so small that instead of giving him a handjob, I had to give him a thumb and forefinger job.
Ex's Tiny Penis
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Explanation
The humor comes from the exaggeration of the ex-boyfriend's small penis size, implying it's so tiny that a full handjob is not feasible and only a thumb and forefinger are required. It is also a bit of an insult or roast to the ex.