From Longman Dictionary of Contemporary Englishpopperpop‧per /ˈpɒpə $ ˈpɑːpər/ noun 1 DC[countable] British English informal a small metal thing that is used to fasten clothes, which works when you press its two parts together SYN snap American English2 → poppers
Examples from the Corpus
popper• Cuffs and hem are adjusted by flaps and poppers, using the natural spring of the fleece.• He opened a tiny bottle and offered me a hit of poppers.• Another snort of poppers and I craved him.• It's popper fastened too, so it will keep everything safe.• Am I alone, though, in questioning the value of the poppers on the bellows side pockets? 