| Noun | 1. | tripper - (slang) someone who has taken a psychedelic drug and is undergoing hallucinationsslang - informal language consisting of words and expressions that are not considered appropriate for formal occasions; often vituperative or vulgar; "their speech was full of slang expressions" | |
| 2. | tripper - a walker or runner who trips and almost falls | |
| 3. | tripper - a tourist who is visiting sights of interest | |
| 4. | tripper - a catch mechanism that acts as a switch; "the pressure activates the tripper and releases the water"catch, stop - a restraint that checks the motion of something; "he used a book as a stop to hold the door open" | |