To be completely under the effects of any strong hallucinogenic drug, such as LSD(i.e. acid) or mushrooms. When you are riding the magic bus, you are so tripping out, that you are able to hallucinate beautiful women in place of what in reality, are women who are tore up or broke down.
When Nick D was relaxing on his bed during an acid trip, he suddenly found himself actually getting laid by a very hot voluptuous bitch who just busted into his room. But unfortuantely, Nick D was so riding the magic bus, as he did not realize he was actually bumping uglies with an ugly, wrecked, hoodrat hoochie mamacheese hog skank!
Mark H. Contributing to the drug abuser's slang vocabulary since February 2004.