The headword (not in LSJ), accented thus, is unattested outside grammarians and lexicographers. Of these,
Etymologicum Magnum 484.55-57 expands the present gloss (for which cf.
kappa 152) most helpfully: "it means him who is being punished, or badly treated". Another possibility is that we are dealing with a pronunciation-dependent spelling of
kakhqo/s, apparently a rarely-attested ([Herodian] 3.1.146) variant for
kakhqh/s or
kakohqh/s ('base in character'). Note the different accentuation, however.
Also possibly relevant are
Hesychius' entries s.v.
kakiqa/ (kappa306)
kakiqh/s (kappa307) and
kakiqe/s (kappa308), glossed as 'hungry' (though cf. LSJ suppl.), 'withered vine' and 'difficult', starving' respectively. See, however, Chantraine s.v.
ka/gkanos on these terms.