Spanish for "Hangover Boner". It is a portmaneau of Guayabo (hangover) and Parola (Boner). Born in the guasca song "Las letanías del guayabo" (The hangover littanys)
Al guayabo de los hombres se le llama guayarola, porque es una revoltura de guayabo con parola.
"Last night I was so wasted when I woke up I had such a guayarola I couldn't stand the light and my bed seemed like a tent around my cock"