People say, “You snooze, you lose,” to mean that if you do not pay attention, you will miss 

a good opportunity. 

For example:

Do your shopping now while there are good deals: Remember, you snooze, you lose.

The job offer is only valid for today. You snooze, you lose!

Don’t delay signing up for the sale, you snooze, you lose the best deals!

If you don’t act quickly, the tickets will be gone. You snooze, you lose!

Linda, hear me out. Bob has been interested in you for ages. Give him a chance. He’s an amazing person. You snooze, you lose. I’m sure you’ll regret that.

Tradução: bobeou, dançou- quem dorme, perde- foi à feira, perdeu a cadeira.