A display between two people to show that some act of genious/awesomeness has just happened. This is said verbally between the two persons. They can also clench a fist and knuckle tap each other whilst saying it for extra affect!
It can also be used when two people say the same thing at the same time.
Vixter- "Iv just had an awesome idea!"
Gazmo- "what?"
Vixter- "Lets watch Kenan and Kel"
The term "boom boom" is most often associated with south east asian countries such as Thailand, Cambodia, or Laos and is used to describe the act of intercourse, usually that which is purchased by males frequenting brothels and whorehouses in those locations. The term is thought to have been created by prostitutes possessing limited english language ability; ie- it is far easier for a non english speaking Thai prostitute to say "You go boom boom"? than it is for her to say "Would you like to go make completely unemotional and detached love with me"?