Cada dos por tres, literally meaning ‘every two by three’, is a very common expression in Spain to refer to something that keeps happening or happens very often. There are other similar synonyms for this such as the more generic muy a menudo or muy frecuentemente, but cada dos por tres is more colloquial and it’s also used to suggest that something is happening every few minutes. AdvertisementSo for example, if you wanted to say that you keep going to the toilet every five minutes, you’d say voy al baño cada dos por tres. Examples:Cada dos por tres se levantaba para fumarse un cigarrillo. Cada dos por tres empieza a llover.