nervous button

A button on a tight sweater or shirt that's being strained to its limits and is hanging on for dear life.

The bank manager's tight cardigan sweater came together just under her buxom chest, held precariously in place by a lone nervous button.

Planeful

A bad experience dealing with airports and airlines, from heavy traffic to lack of parking, to interminable lines to check in or get through security, to delayed and cancelled flights, to obnoxious flight attendants , to drunken assholes on the flight and, when all is said and done, lost luggage.

Jim flies for a living but said yesterday was the most planeful experience he’d had in ten years

Flatonic

A level of comfort in a relationship in which the parties no longer feel the need to hide farts from one another.

After two months of dating, Mike and Teri's relationship has become flatonic; he no longer bothers to move from the couch when passing gas and she no longer runs to the bathroom -- out of embarrassment -- to flatulate.