IPA: /ɪnˈkɒɡ.nɪ.təʊ/
KK: /ɪnˈkɑɡnoʊ/
Not revealing one's identity; in disguise or hidden.
He traveled incog to avoid being recognized by fans.
Incog is derived from the abbreviation of 'incognito', which comes from the Latin 'incognitus' (meaning unknown or not recognized), formed from 'in-' (meaning not) and 'cognitus' (meaning known). The term refers to someone who is not known or is in disguise.
Think of someone who is 'not known' ('in-' means not and 'cognitus' means known) — that's why incog refers to being in disguise or hidden.