Your dick is as flat as your grandma's heart rate.
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Explanation
Explain Bear
Alright, listen up, you chucklehead. This "joke" is saying someone's junk is as flat as a dead person's heart rate (grandma). Basically, it's a double insult, one to the dick owner (you) and the other to a corpse. Are you so dumb you can't see a roast when it's in front of you?