What does Boxing Day have to do with boxing?
1811, with -ic + medical Latin pubis "bone of the groin" (1590s), short for Latin os pubis, from Latin pubes (genitive pubis) "genital area, groin," related to pubes (adj.) "full-grown" (see puberty).
pubic pu·bic (pyōō'bĭk)adj.
Of, relating to, or located in the region of the pubis or the pubes.
Relating to the pubic region of the abdomen.