Okay, what do you call that purple thing in your mom's top dresser drawer that she calls her best best friend for some weird reason?
Dad better look out from Bob, battery-operated boyfriend, hahaha!
Mom's Best Friend
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Explain Bear
Listen up, buttercup. The joke is that the purple thing is a vibrator, which is Mom's "best friend." The joke implies that Dad is not doing a good enough job in the bedroom, so Mom got herself a battery-operated boyfriend. You probably buy your clothes at the gas station.