A colloquial term for someone who is grumpy or irritable.
Mi vecino es un verdadero gonchu que siempre se queja de todo.
My neighbor is a real grouch who always complains about everything.
Siempre he considerado a mi vecino un gonchu, ya que nunca sonríe ni saluda.
I have always considered my neighbor a grouch, as he never smiles or greets anyone.