they are yelling at someone hidden by their collective girth

Couch Tomato

Senior Member
Russian & Dutch
The fat men are outside of the tent with Scott, and they are yelling at someone hidden by their collective girth. A huge school bus painted green—it’s running, and the driver is inching toward our tent. On the hood of the bus is a portrait of Brian Dawkins’s bust, and the likeness is incredible. (Dawkins is a regular Pro Bowler who plays free safety for the Birds.)
(The Silver Linings Playbook - Matthew Quick)

Collins Concise English Dictionary © HarperCollins Publishers::

girth /ɡɜːθ/ n
  • the distance around something; circumference
  • a band around a horse's belly to keep the saddle in position
What is the meaning of "collective girth" in this context? Hopefully I have provided enough context.

Thank you in advance.
 
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