Synonymous with the one word form (boomshakalaka). This is like a slap in the face when you beat somebody one on one, or when something amazing happens.
(insert any form of 1 on 1 game, where person 1 totally schools person 2)...
Person 1: "Boom shakalaka!"
A limp, old, saggy penis.
"Dude, the other day I was in the men's locker room and some old guy had a huge floppy jalopy!"
"Dude, your grandpa's floppy jalopy is hangin' out..."
This is when you are so out of shape (because it happens more often) that when you play a game online with a buddy against 2 other guys and you are trying to get 1st so bad that your heart starts beating so fast and you start sweating and then you can't sleep for like an hour because you have too much adrenaline.
Man, the other day I got some good cybercise when me and my buddy played a 2v2 CTF on UT, the only problem was I couldn't sleep for like 2 hours afterwards!
Definitely a cool kid. Although all the girls love him, he doesn't love all the girls. He will play varsity soccer and score tons of goals and be an amazing soccer player so get his autograph now before he is too amazing and forgets all the little people. Goes to Mexico all the time and gets hot girls to like him (one of the Three Eagles that is). Listens to all the cool bands, such as REM, Boston, Fleetwood Mac, and many others. Also he owns all his buddies at Counterstrike Source and Unreal Tournament, and will become a pro CS player and earn tons of money
Hey, look over there, it's Nitaro02, the best CS, UT, and soccer player ever! Let's get his autograph!