Main Page | See live article | Alphabetical index A popper is a jalapeno pepper which has been covered in cream or cheddar cheese sauce and then breaded - a popular treat for fast-food aficionados of Sonic Drive-In and Arby's Fast-food restaurants. It is also the surname of philosopher Karl Popper and the singular of the drug poppers. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.