* A trip or journey: In this case, it might be a shortened version of "un voyage" or "un déplacement".
* Someone who is easily tricked: This usage is similar to "a sucker" in English.
* A sexually transmitted infection (STI): This meaning is more likely if used in a specific context related to health or sexual activity.
To understand the meaning of "tripper" in French, you need more context.
For example:
* "J'ai fait un tripper à Paris." This means "I took a trip to Paris."
* "Il est un vrai tripper, il se fait avoir à chaque fois." This means "He's a real sucker, he gets tricked every time."
* "Le médecin a diagnostiqué un tripper." This means "The doctor diagnosed an STI."
If you can provide more context, I can help you understand the specific meaning of "tripper" in your case.