[P] for Polite, acceptable in the most decrete and well educated circles and public speaking.
[C] for Common, acceptable among average folk, friends, mixed company (male & female), and speaking to closed groups
[V] for Vulgar, might be considered unrefined, crude, or even inflamitory. NOT for public speaking. NOT for mixed company.

• Horses have gum lines that recede with age. Hence older horses have longer teeth than young horses.To "look a horse in the mouth" is to examine the horse's mouth closely to determine its age (and therefore its usefulness and/or worth). To immediately judge a gift based on its worth or usefulness rather than the "thought" behind it considered rude, and ungrateful (it is a gift after all, and didn't cost the receiver anything).

Drop a dime (C)-1/2
Make a phone call

• This is a good phrase to discuss with anyone born after 1970. Pay phones cost 35, 50, or even 75 cents today, but they really did cost 10 cents at one time. The dime was dropped into the slot of the pay phone.

e.g.Don't be such a stranger. Drop a dime some time.

CLEAR AS A BELL (P)-26/1
Clearly understood.

• Bells such as the type used in churches are large and loud. Their sound can be heard from a great distance. Bells sound a single, clear note so their sound is distinctive and not easily confused.

e.g. You don't have to repeat yourself. Your message is clear as a bell.

BRAND SPANKING NEW (P)
New and unused.

• Doctors have traditionally spanked babies immediately after delivery to start them crying, and breathing.

e.g. What you really need is a brand spanking new Porsche turbo.

BLOWING SMOKE (P)
To be boasting without being able to back it up, talking about action without intent to follow through.

• Magicians often use smoke in their performance to obscure your view and conceal a bit of trickery.A person who is "blowing smoke" is tricking you and attempting to cover it up.

e.g.Do you really want to buy this car or are you just blowing smoke?