It is the name of a small island of Canary Islands. In Colombia it is the same as spring, rubber tapper, slingshot, arrow. It is an instrument that is used to forcely throw stones. It consists of a chamois and rubber strips.
In Argentina, a gomera is a weapon with a Y fork and two elastics with a piece of leather where a stone goes to throw it.
GOMERA: In Argentina, Slingshot, bodoque, honda.
GOMERA: Colloquially, woman who chooses his companions according to the car you have.