What is "dumbs"

Usage examples of "dumbs".

Nice and atmospheric for the dumbs, but the clothes didn't give her nearly enough warmth for predawn in the high cedar scrub forest around Sedona.

Bourne could turn the dumbs into smarts, but not an officially mounted surveillance detail.

But the more lively transmission is in the other direction, from the smarts (them) to the dumbs (us) (see Chapter 31).