It is an inflection of enjarrar, which means to flatten, flatten or pañetar a wall with cement or mortar. It is a term used in construction and in masonry.
Inflection of the verb enjarrar ("to plaster a surface, cover it with mud or cement", "to put the arms in a jar"). See verbs/enjarró .
It is said enjarró when a player, mainly football puts his hands and arms on the waist in the form of a jug, that is said enjarrar