Question:

What are symptoms of being "slapped"?

Answer:

The cost per click of your keywords are raised from 5 cents to a minimum of
20 to 40 cents per click (this is the little slap, you need to refine your
keywords and ads).

The cost of your keywords are raised to a minimum of $5 to $10 per click
(this is the big slap, your domain has been slammed by google for
irrelevant/no content).

If you have a site in medium or highly competitive market and were paying
$0.30-$0.50 per click you are now seeing a huge reduction in the number of
impressions and a penalty in the placement.