noun, plural boo-boos. Slang.
a stupid or silly mistake; blunder.
a minor injury.
shock, loss, cramp, cut, bruise, burn, wound, damage, laceration, sore, suffering, abuse, trauma, fracture, swelling, scar, sprain, omission, misstep, aberration
Origin of boo-boo
An Americanism dating back to 1950–55; baby talk
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
noun plural -boos
informal an embarrassing mistake; blunder
Word Origin for boo-boo
C20: perhaps from nursery talk; compare boohoo
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
"mistake," 1954, apparently a reduplication of boob, which had acquired a secondary sense of "foolish mistake" (1934).
Online Etymology Dictionary, © 2010 Douglas Harper