Something your mind gets stuck on while tripping, and you just can't get over it (often dominates the entire trip). This can be an idea, problem, person, or even things.
> Dude: I just can't get over the fact that like, how did the universe come into being, what does it all mean?
> Cade: Better let it go man, you spend your whole trip thinking about it.
> Dude: I just can't bra.
> Cade: Well you're caught up in a trip trap then.