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1.
(from William Magear Tweed, political leader in New York City 1823-1878) over-development, unnecessary development, or development out of character with the neighborhood, facilitated by corrupt zoning changes, tax abatements, or incentives by politicians to benefit politically connected developers. In short: private gain at public expense.
That area was once two-family homes, now it is being converted to high rises because of a zoning change, it is tweeding in action.
by patsw December 23, 2009
 
2.
Doing something awesome or amazing in general.
We be Tweeding!
We are Tweeding tonight!
by D.E.L.L.Y. August 10, 2011
 
3.
Riding a bicycle while wearing tweed, especially with others in similar attire.
Cycle shop manager "What are you up to tomorrow?"
Cycle mechanic "I'm going tweeding"
by Dee Railleur May 18, 2010
 
4.
The process of unfollowing people on Twitter.
I just spent an hour tweeding hash taggers from my twitter follow list.
by thepixelsuite December 03, 2008