The word chincuales, like all the words in the Mexican tongue, has a number of senses.
First, it means flea or bedbug bites. The bites itch, and the poor victims can&#'t stop scratching, as you can readily imagine.
Hence the second meaning, which is restless people who squirm and scratch and can&#'t sit still, to the discomfort of anyone who&#'s forced to watch them.
Related to this is the final sense, call it the Guerrist sense, which applies to a certain class of traveler, to adventurers of the mind, those who can&#'t keep still mentally.