In Hindi, Bandar means "monkey" and log means "people" – hence the term simply refers to "monkey people".
The term has also since come to refer to "any body of irresponsible chatterers".
[1] The Bandar-log feature most prominently in the story "Kaa's Hunting", where their scatterbrained anarchy causes them to be treated as pariahs by the rest of the jungle.
[2] Their foolish and chattering ways are illustrated by their slogan: We are great.
[3] The Road-Song of the Bandar-log is a companion poem to 'Kaa's Hunting', and demonstrates Kipling's strong adherence to poetic form.