It's a "random, unprovoked thoughts of torturing and

Literally everyone gets that sometimes.

If it happens all the time and bothers you, you might have a problem.

>busty young european blonde starts working in my office
>every time I see her vividly picture murdering her and what she will look like when she's rotting and making violent love to her bloated corpse
>force a smile and tell her good morning
I actively avoid her and it interferes with my productivity, but I'm in therapy and on meds so there's that.

I get that all the time, dude, especially with prostitutes or the homeless. Wouldn't worry about it.