There is obviously a literal meaning of "trap", as in a booby trap, and a colloquial meaning of "trap." I noticed this from this recent post. Someone who dislikes blood or injury themes might reasonably add "trap" to their blacklist for the first sense, but that will hide urelated posts that the user may want to see. Conversely someone who blacklists the second meaning may not want to block images containing the first meaning.
So the answer, I guess, is to change one of the meanings to a different tag. The colloquial sense of trap has several specific implications that would be lost by changing that meaning to a new tag, It seems like it doesn't have a good synonym. The other meaning has an easy synonym, so I would suggest changing the first sense of trap to booby_trap, which still conveys the same meaning specifically, and reserve the trap tag for the colloquial usage.
I wanted to see if this has been discussed before, or if there's a better solution I'm not seeing.
Updated by Halite