Used as an exclamation when something incredibly spectacular happens. It can also be used to describe a clutch performance or an otherwise impressive feat.
As his teammate clinches a victory, Jake exclaims “Boom Baby!!”
When something 'extra' special happens, just add "Kaboom" for emphasis...
When you fuck a girl in all her holes,and right after u cum in her you place a plug in that holethis includes all holes you came in) then once your done,you connect all plugs to a chain and yank them out all at once. If done correctly, the girl will orgasm and shoot cum out of all holes.
Wade: "Hey Jim,wheres my little sister?"
Jim: "Oh shes just recovering."
Wade: "from what."
Jim: "The Boom Baby Blow"
Wade: "STAY THE HELL AWAY FROM MY LITTLE SIS!"