What does Boxing Day have to do with boxing?
c.1400, loscion, from Old French lotion (14c.), from Latin lotionem (nominative lotio) "a washing," from lotus, popular form of lautus, past participle of lavere "to wash" (see lave). As a verb, from 1817. Related: Lotioned; lotioning.
lotion lo·tion (lō'shən)
A medicated preparation consisting of a liquid suspension or dispersion intended for external application.
Any of various externally applied cosmetic liquids.