I believe you are referring to this post, regarding the superstition behind the scottish play.

While explanations vary for reasons why the name of the play isn’t spoken, the general rules are, as follows;

1. you are not allowed to say the name of the play inside a theater
2. you cannot quote lines within a theater unless it is part of an actual rehearsal or performance of the play.
3. The lead character is referred to as Scottish King/Scottish Lord.
   
4. His wife is referred to as Scottish Lady

If the name is spoken, tradition decrees that the speaker exit the theater, turn counterclockwise three times, spit over their left shoulder, curse or recite a line from another Shakespeare play, knock and then wait to be invited back in.

for more theater superstitions check out this link, this one too!

So to answer your question, you are should be safe to say it outside of a theater (especially if you aren’t a thespian)… but many still try to avoid it all together. I just think it’s fun.