It may meet the threshold for assault, depending on jurisdiction.

In the U.S., the crime of assault consists of acting as if you are about to hurt someone, including verbal and gestural threats. Actually harming them comes under the umbrella of the separate crime of "battery", hence the phrase "assault and battery".

So yes, if you go to someone else's house, set up a "slicey boi", and behave as if you fully intend to use it, you could be charged with a violent crime.