1) It's an indication of income level and social class. There was a huge wave of Irish immigration into Boston in the 1800s, particularly 1848-1852 during the potato famine. Most of the immigrants were poor, looked down on, and formed an underclass. I've mostly heard the phrases "shanty Irish" (poor) and "lace-curtain Irish" (not poor), but pretty obviously "two-toilet Irish" is the next step up. 2) "You look like you could do with X" means "you look like you need X" or "you look like you are OK but would be better with X." "To feed up" normally applies to fattening up animals. Until you asked your question, I never noticed the ambiguity of the word "feed." "To feed" _can_ mean "to eat," as in "a koala feeds on eucalyptus leaves." Usually, though, "to feed" means "to give food." A mother feeds her child, the child eats. A farmer feeds his hogs, the hogs eat. If a farmer gives a lot of food to the hogs in order to make them gain wait, he "feeds up" his hogs. 3) I don't know the meaning in this context, sorry. 4) "To net" can mean "to capture in a net." "Tribal fishermen returned to Willamette Falls and netted fifteen salmon." By extension it can refer to capturing anything, such as illegal drugs. It's not very common. Don't try to use it yourself. It can also be used in a business or accounting setting, meaning net earnings as opposed to gross earnings: "The business grossed $50 million but only netted $2 million."

1. I haven't heard this but assume it denotes relative wealth. 2. "Do with" is an idiom. Commonly heard. Informal. 3. Would need more context. The Iraq war was a "pre-emptive" war because our president thought (wrongly) that Iraq was developing WMD. We got to them before they got to us. Or something like that. 4. Yes, but I would not advise you to use it. Informal. It's hard to define when to use it. Pretty infrequent. Also, I would call these excerpts. You could also call them extracts or quotes.

3 "we gave you all the information required for a successful pre-emptive sale" "Pre-emptive" means before the object of the sale is available on the open market. This is a commonly used term in the business world. For example, pre-emptive real estate sales are commonplace at the moment in many parts of the US. A person selling a house approaches a real estate agent, who tells the other agents in his or her office. One of those agents has a client looking for just that kind of house and they sign a contract before the house is ever listed on the open market MLS.