Definition
A rhetorical question used to express that the answer to a previous question is blatantly obvious, often with sarcasm or impatience.
"Do you think he'll accept the job?" "Does a bear shit in the woods?"
"Is the food good at this restaurant?" "Does a bear shit in the woods?" It's a no-brainer.
"Will he be on time?" "Do bears shit in the woods?" Of course he will.