Casual indifference rolls off of him

[meliss]

Hi. I found several definitions of roll off, but still don't understand whether his casual indifference become bigger or smaller...
"Casual indifference rolls off of him as he situates himself on the bike" (An Optimist's Guide to Heartbreak by Jennifer Hartmann).

 

[teechar]

Here, "roll off" means something like "emanate".

Casual indifference rolls off of him

≈ He shows casual indifference

 

[teechar]

Actually, another interpretation is possible. Can you please quote more of the text before and after that part?

 

[meliss]

Actually, another interpretation is possible. Can you please quote more of the text before and after that part?

Cal gives me a onceover, staring at my painted toenails poking out through my heels, raking over my legs sheathed in tattered denim, lingering on the tangerine tank top, and landing at the helmet. “You look good,” he murmurs. Turning around, he moves toward the motorcycle.
Casual indifference rolls off of him as he situates himself on the bike, and I almost miss the compliment.
“Hop on,” he continues as he straddles the seat. “Sit close to me so you can mirror my body language. When I turn, you turn with me. Try not to wiggle too much or shift abruptly. Wrap your arms around my waist and hold on. Don’t be afraid to hang on tight—you won’t hurt me.”

 

[teechar]

I think what I said in post #2 is the right interpretation.