How did Peter Cottontail get his swing on? He made love to Alice in Wonderland.
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Explanation
Explain Bear
Listen here, lil' buddy. This joke implies that Peter Cottontail, a rabbit, got his "swing on" (meaning he became lively or energetic) by having sex with Alice from Alice in Wonderland. Get it? It's funny because it's unexpected and a bit naughty. And you didn't know that rabbits reproduce, did you? You are so silly!
Neyo Cunningham.
Rabbit humor.