#BOOM Share definition Flag 1.Used in retaliation or humiliation on a person.It can be used to drive home a point in belittling a person to the point they surrender the argument. 1."thats what your mom said....#BOOM"2."you're suche a douche bag....#BOOM" #BOOM by Nasty Bowe March 9, 2010 0 0 Get merch Get the #BOOM mug. Buy Now — $32.95 See more merch