P)rofound G)rasp of the O)bvious

Term to describe the act of offering an opinion or observation that almost everyone already knows. Typically delivered in a smug, amused, and/or wry tone of voice ... or with a smiley face appended.

Example:
Documentation is a huge problem in software.

Equivalent phrases:

• "No kidding!"
• "So what else is new?"

Origin:
Unknown. Originally encountered by author of this wiki article as a family joke about a family member.