cbfh is an acronym meaning "country boys f*ck hard". This is derived from the knowledge that guys who grow up in the country know how to do it, and do it well. Perhaps influenced by watching, or on the rare occasion even interacting with, farm animals.
dude 1: "Check out that guy! He's hot"
dude 2: "Yeah, he's a country boy... cbfh"
Portmanteau of flush and douche; used in circumstances where some discretion is required for referring to this act of personal hygiene. Also convenient as a backup term for those people who are uncomfortable saying douche in polite company.
I'd lined up a hot root who was going to top me and wanted to make sure I'd cleaned up nicely for him so had a quick flouche before he swung by. Glad I did coz it wasn't so fresh in there.