1.
kiseru; traditional Japanese smoking pipe
A traditional Japanese pipe with a small metal bowl and long bamboo stem, used for smoking finely shredded tobacco.
2.
fare evasion (on trains)
Slang for riding a train while only paying for the first and last portions of the journey, skipping the fare for the middle section. Named because a kiseru pipe has metal at both ends and bamboo in the middle — like a ticket that only covers the endpoints.
Etymology
From Khmer (khsier); 煙管 is an ateji spelling. The fare-evasion sense comes from the pipe's shape: metal (金) at both ends and bamboo in the middle. 金 also means money, so the fare is paid only at the two ends of the journey.
Writing
Usually written in katakana, キセル, and almost always so in the fare sense (キセル乗車).