The term "topper" can refer to several different meanings depending on the context in which it is used.
1) In a general sense, "topper" could be an informal term for someone who consistently performs well or excels at something, often being used as a complimentary term such as "he's a real topper at math."
2) It can also refer to a type of automobile, specifically one that is convertible and has a retractable roof.
3) In the world of fashion, "topper" could mean a small hat or cap worn on top of another hat as a decorative accessory.
4) Lastly, in the context of alcoholic beverages, "topper" can refer to a small amount of liquid added to a glass of champagne or sparkling wine to create bubbles and fizz.