Used to typically describe a charger box, most commonly for phones that use a USB cable to charge.
“I’m at 7 percent on my battery. Do you have your boxpiece with you?”

“You can use my boxpiece this time, but you need to go on Amazon and get you a five-pack. Last time I looked, they was only $15.”
by XStewart2007 November 24, 2021
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The way heroin is sold in prison. Small amount of heroin folded in a piece of paper into a little box.
Yo who got any boxpieces for sale.
by Werd6y6 December 31, 2018
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