Algo complejo y sencillo a la vez/// Boys and girls, sex and drugs
1. a favourite book carried everywhere.
2. a referential book such as a handbook or manual.
3. a useful object, constantly carried on one’s person.
Etymology: Latin vāde (go, walk), the second-person singular present active imperative of vādō (I go, I walk) + mēcum (with me), literally meaning “go with me!”.