What is "b's"

Usage examples of "b's".

The walls, which Herb had panelled himself in first-quality finished pine, had been stippled with spikes Seth had found in Herb's garage workshop.

David Carver, who had sometimes played poker with Herb and Herb's friends on Thursday nights, lay on his front walk like a beached whale.

I don't know what it is or why it happens, but as an antidote to the SLB's rages, it beats rubbing off in the bathroom eight ways to Sunday.

Thank God he was napping when the doorbell rang, & thank God Herb's at work, because the SLB eavesdrops on Herb's mind sometimes, I know he does.