- an abolitionist guerrilla of Missouri and Kansas in Civil War days
- a robber, raider, or plunderer
- Informal a person born or living in Kansas
See jayhawker in American Heritage Dictionary 4
- One of the free-soil guerrillas in Kansas and Missouri during the border disputes of 1854 to 1859.
- A Unionist guerrilla.
- Jayhawker Informal A native or resident of Kansas.
Origin: From jayhawk, a fictitious bird