पर्स गिर गया

You use this when you see a drop happen. Just point and say it clearly. You can add आपका (aapka) at the start for politeness. This makes it "Your purse fell." If you are in a rush, the short version works fine. Most people will understand immediately. They will likely be very grateful to you.

Use it at the market or a busy station. Use it when getting out of an auto-rickshaw. It is perfect for crowded places like Delhi or Mumbai. If a friend drops their bag at a cafe, say it. If a stranger drops their wallet on the sidewalk, say it. It is a universal 'hero' phrase for daily life.

Do not use it if the item is still in their hand! That would be a very confusing joke. Also, do not use it for heavy luggage. For a big suitcase, use the word सामान (saaman) instead. If the purse is just open, this phrase is wrong. In that case, say the purse is open instead.

In India, people are generally very helpful in public. If you drop something, three people might shout to tell you. Honesty is a big cultural value in many communities. Helping someone save their money is considered a good deed. Using the English word पर्स is very common. Almost everyone in India knows this word. It shows how English and Hindi blend together perfectly.

You can say आपका पर्स गिर गया है for better grammar. To be very formal, use जी (ji) at the end. If you are talking to a friend, तेरा पर्स गिर गया works too. Sometimes people just say पर्स! and point. All of these get the job done. Just make sure you sound helpful, not scary!