It is an Americanism, a castilianization of the English Jeep ("off-road vehicle).
In Colombia it is the familiar and colloquial way of calling a very popular campero and very old models of the Jeep brand. It is widely used on the coffee shaft as a cargo vehicle and passengers and is abused its great capacity and endurance. Yipao contests are held, which involves trying to place as much cargo as possible on a yip and make it walk.
YIP Spanishization and deformation of the spelling, Jeep, 4x4 traction vehicle for tortuous or rugged roads. In Colombia, Guatemala, Nicaragua, El Salvador: off-road vehicle