A "new dat" is a person that jumped on the new orleans saintsbandwagon in the year of 2009 - 2010. Some one you cant even name 5 players but say there a fan.
Hipsters and wannabe urbanites who move from suburban wastelands to NYC believing they will make it big in business, Broadway, or some other NY industry. Eventually, these mid-western suburbanites leave NYC generally after 1-2 years, after they realize they can't take the fast paced culture of NYC, get frustrated, and move to a more laid back city out west (Los Angeles, Seattle, or even back home). Those who expire are generally replaced with another hipster-suburbanite, who will eventually reach his/her expiration date, and the cycle continues.
Hipster E. village kid from Washington: Hey wheres Thom?