The last time I had a bird poop on me (on my clothes I think) was few years back while walking in the office compound with Mo-C. Nothing bad happened.
The logical answer is to wash your hair immediately. But what to do about buang sui? ‘ward off bad luck’
My mom and grandma consider having a bird poop on you is bad luck. I was asked to eat mee suah with double boiled eggs to expel any bad luck coming my way.