In bad taste. Gaudy.

Kills someone or something. Originally refers to a nautical expression indicating a water depth of 6 fathoms (36 feet) as measured by a sounding line.

Where are you? What's your location?

Completely; Without any reservation. For example,

The government made up such a compelling story that the public fell for it hook line and sinker.

This means whatever turns you on, interests you, suites you, something you like, your preference or choice. Sometimes with a teasing or sarcastic tone to mean I have a different view. For example,

The last part of something, for example a race, journey or project.

Obama leads in home stretch, as both men sprint to the finish line.

(informal) An extremely impressive event or successful outcome. For example,

Chris' latest auction was a real barnburner. He saved $70k over $700k spend.