When a person says they are “tripping,” it means they are experiencing the effects of hallucinogens. Hallucinogens are psychoactive (mind-altering) drugs that significantly alter our senses and perceptions. Some common ones are magic mushrooms, LSD and ecstasy. Cannabis can also cause hallucinogenic effects at high doses.
Hallucinogens cause people to have experiences that are different from their ordinary reality. The conscious mind becomes aware of things that it normally is not aware of. Hallucinations can range from mild distortions of our senses to an intense experience where we believe a vision or other altered perception is real and we are unaware it is the effect of the drug.