coa

primitive hoe, a sharp wooden rod formerly used by Native Americans to till the soil; low-class or criminal jargon

bus, specifically a Melillan bus

“Deberían poner una parada en la puerta/esquina de las oficinas de la coa. Los que vamos a renovar mensualmente las tarjetas y queremos ir al centro no tenemos opción de coger la coa allí y tenemos que ir a la parada que está en la frontera o en minas de Rif.” — They should put a bus stop right at the door/corner of the COA offices. Those of us who renew our cards monthly and want to go downtown don't have the option of catching the COA bus there and have to go to the stop at the border or in Minas de Rif.

From C.O.A., Acronym of Cooperativa Ómnibus de Autobuses, a Melillan bus company.