Stock question

basically it means a stock has gotten ahead of itself on either the upside or the downside

stocks traditionally should trade at some multiple of its forward earnings projection...so if you hear a stock is trading at 10 times earnings when the true value is 8x earnings, the stock is overbought...conversely if its trading at 6x earnings, it's oversold

Relative strength index or RSI oscillator will help you find overbought and oversold conditions.

link 

there are a few others, but RSI is probably the most popular. 

you can generally get it with any good charting software.

Just a fancy term for being worth more or less than the current price.

Fuckin stocm market people love to create stupid unnecessary  terminology and phraseology to make themselves look like they know something special.

Almost as bad as lawyers. 

cd - see depeche's answer

each analyst will have earnings estimates on a company...so something could be "cheap" in one man's eyes while being "expensive" in another's

it's all bs...ive had much more luck with top down long term investments than anything else recently