Having to pass gas so very badly, usually in the height of quietness, during an Exam...sqweeeeezing the sphinkter muscle tightly, however, this always fails... resulting in a tune squeaked out that sounds like a dying Elephant.
Usually proceded by intense laughter, Brown underwear and lifelong embarressment.

when a nazi zombie gets totally owned by a bazooka

now if your car aint got it go out and get it, we like the boom and dont you forget it. so turn down the trevel and fluant your bass, so your car could be heard almost anyplace. cause when your in the streets we cant go far without hearing the boom pouring out your cars. So if your speakers weak please turn it off cause we like the cars that sound so tough.

Your mom is dead.

So many kinds where can we start...
we like them dumb and we like them smart.I like the ones with the pretty eyes. Well i like all kinds of guys. STOP, what happened? How about the ones we especially like. Which ones? You know the ones with the cars that go. I hear ya. Hit it. It was me and the possy with bunny d. We were cruizn in the jags or the lamberginies. When low in behold there apeard a morrage. He was hookin up a car in his daddys garage.We stoped short did a double take.He was lookin so fine i thought i wasnt awake.He was obviously hooking up face i asume. But then he turned the little button AND THE CAR WENT BOOM! We like them short and we like them tall. We like them one and we like them all.THey're always adding speakers when they find the room. As they know we love the guys with the cars that go BOOM. And see my boufriend really knows where its at. Hes got 50 inch wolfers all along the back.He makes a car man. Im going to my room. But id rather say OWW WITH HIS CAR THAT GOES BOOM!

Much like the cars that bounce, cars that go boom will explode seconds after who begin to bounce.

Another way to say that something has gone terribly wrong

When a car explodes in such a stupid manner that you can’t help but laugh and perhaps record it.

While being a rather random phrase, "beech go boom" (bitch going boom!) recently recieved a set of meanings, due to repeated use in several chatting services.
The first chatter to use it was in fact only replying to a string of illeterate shouts people were making on purpose to make fun of famous qoutes and the ORLY fad, using several times leet (1337speak).

The meanings can differ. But the original meant "Bitch, you fail."
Then next time it was used, by the same chatter, it was trying to tell the person that was subjected to the use of it to get over his/her problems.
There are also some vague meanings floating around, but these were the two most common.