Definition of "pop in" []

• To visit in an impromptu manner. (verb)

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• "You hop on the treadmill, jump on the bike, or step on the elliptical trainer; then you turn on the TV or pop in the earphones of your iPod or flip through the trifecta of required reading People, Us Weekly, and In Touch, and off you go … to nowhere fast."
• "Our only good day at Boring included an hour-long, kidney-bruising bus ride to the firing range located somewhere out in the middle of Nowhere, Kuwait, where we needed to pop in and fire a clip of ammo to make sure our weapons had survived the long journey over the ocean."
• "Cruising into second with a standup double, he is mobbed by his teammates as a parade of flashbulbs pop in celebration of his newly constructed penthouse; a place where only he resides as the man with the most career hits in the history of the New York Yankees."