boo piece Share definition Flag boo piece, derived from the word "boo". Pertains to a significant other. also known as "boyfriend" or "girlfriend". My dad bought his boo piece a louis vuitton luggage set cause he's whipped. boo piece by Tumn May 2, 2008 0 0 Get merch Get the boo piece mug. Buy Now — $32.95 See more merch
