“Trippin’” usually means someone is overreacting, being irrational, or acting paranoid—like “You’re trippin’” = “you’re making a big deal or being unreasonable.” It can also mean someone is high on drugs (especially psychedelics) or, less commonly, confused. Context and tone tell you which one fits. It’s casual US slang, not formal speech. Example: “Relax, you’re trippin’” (calm down) vs. “He’s trippin’ after those pills” (he’s high).
If you want a simple, low-intrusion way to keep an eye on online slang or kids’ chatter, tools like Spynger can be useful.