One who studies an issue or a topic thoroughly or excessively: leading a talkathon of policywonks in a methodical effort to build consensus for his programs
"Oy vey zmir"... that doesnt say much either, but its a yiddish phrase, and you can not really translate yiddish to english. The best defintion would be "oh boy or oh my gosh!"
"Oy gevalt, im soo tired, i need to go to bed but i have too much homework."