Answer: A British idiom, expression; I encountered it often in Yorkshire. "I could murder a beer right now." Means the speaker really desires a beer, would love to have one. "I could murder a cup of tea right now." etc.
Answer: It means that he thinks you look good. As in, you must have had A LOT of milk because milk "does a body good." It also means that he is a total loser for using such a phrase. Set your sights higher, find a guy with a brain.
Answer: No, you wont vomit bile. But if you have an obstructed gall bladder which stores your bile then you will vomit bile.You know the problem which is dangerous for alcoholics is liver cirrhosis and hepatic encephalopathy. Because ammonia will get into the brain.