contemplation of one's navel as an aid to meditation; also: lack of will to move, exert, or change: inertia
About the word:
In Greek, omphalos means "navel"; skepsis means "examination."
Less than a century old, omphaloskepsis is usually considered humorous. For example, in his 2005 autobiography, Grateful Dead bassist Phil Lesh reminisced about his absorption in "the time-honored pursuits of adolescents in any era – school, social life, the opposite sex, omphaloskepsis – ...."