Used as a generic intensifier. "I am a consumer whore, and how" can be roughly interpreted as "I am a consumer whore, and very much so". Similar expressions also appear in other languages, as German "Ich bin ein arsloch und wie". By extension, "and how" can also be used as an expression of agreement or assent, in the manner of "mos def" and related terms.

something said to your chums when you haven't seen them in a bit, usually with a beer in your hand and a few in your belly

also something you say to someone you meet on the street that you recognize but don't know very well. A type of "nod" and courtesy to say hello.

A word used to describe an agreement with an opinion or statement. used as an expression, similiar to: indeed. or sweet jesus i agree!

A great game to play when you're bored in class. Start by writing Who, What, When, Where, Why, and How down the side of a paper. Beside who, write a person's name. Fold over so you can't see "who" and pass on to a friend. The next person writes an action beside "what", folds over, passes on. Continue until all of the titles are filled out, then open and read.

used as a question to ask how a person is doing, or how you do somthing

-In what way or manner; by what means? How did the accident happen?
-To what extent, degree, etc.?: How damaged is the car?
-In what state or condition?: How are you?
-For what reason; why?: How can you talk such nonsense?
-To what effect; with what meaning?: How is one to interpret his action?
-What?: How do you mean? If they don't have vanilla, how about chocolate?
-(Used as an intensifier): How seldom I go there!
-By what title or name?: How does one address the president?
-At what price: How are the new cars going, cheaper than last year's models?
-By what amount or in what measure or quantity?: How do you sell these tomatoes?
-In what form or shape?: How does the demon appear in the first act of the opera? How does the medication come?
Conjunction
-The manner or way in which: He couldn't figure out how to solve the problem.
-About the manner, condition, or way in which: I don't care how you leave your desk when you go. Be careful how you act.
-In whatever manner or way; however: You can travel how you please.
-Informal that He told us how he was honest and could be trusted.
Noun
-A question concerning the way or manner in which something is done, achieved, etc.: a child's unending whys and how’s.
-A way or manner of doing something: to consider all the how’s and wherefores.
-A word formerly used in communications to represent the letter H.
Idioms
-And how! Informal. certainly! you bet!: Am I happy? And how!
...

Points out that circumstances or behavior should have been obvious or anticipated when taking time and place into consideration. What do you expect considering where you happen to be and what you happen to be doing?