Jayhawker
Jayhawkers is a term that came to prominence just before the American Civil War in Bleeding Kansas, where it was adopted by militant bands affiliated with the free-state cause. These bands, known as "Jayhawkers", were guerrilla fighters who often clashed with pro-slavery groups from Missouri known at the time as "Border Ruffians". After the Civil War, the word "Jayhawker" became synonymous with the people of Kansas. Today a modified version of the term, Jayhawk, is used as a nickname for a native-born Kansan, but more typically for a student, fan, or alumnus of the University of Kansas.
Origin
The origin of the term "Jayhawker" is uncertain. The term was adopted as a nickname by a group of emigrants traveling to California in 1849. The origin of the term may go back as far as the Revolutionary War, when it was reportedly used to describe a group associated with American patriot John Jay.
First published "in 1858 or 1859", the slang term “jayhawking” became widely used as a synonym for stealing. Examples include: