Meaning

noun British philosopher (born in Austria) who argued that scientific theories can never be proved to be true, but are tested by attempts to falsify them (1902-1994)

noun a container of stimulant drug (amyl nitrate or butyl nitrite)

noun a container for cooking popcorn

originAmyl nitrites were originally sold in small glass ampoules wrapped in cloth. Recreational users would crush or "pop" these vials between their fingers to release their vapours, which is thought to be the origin of the slang term.

Etymology from Wiktionary, CC BY-SA 3.0