self-satisfaction; complacency; smugness
Casual abbreviation of 自己満足. Often used critically or self-deprecatingly to describe someone being pleased with themselves without regard for others' opinions.
See also: 自己満足
His stories always end up being just self-satisfaction.
Posting on social media might be self-satisfaction, but it's fun.
Abbreviation of 自己満足 (じこまんぞく, 'self-satisfaction').