Mulling/milling around in NYC

TV people on CNN keep saying that New Yorkers are "mulling around." Shouldn't that be "milling around"? Are they just plain wrong or is there a new meaning for "mulling" in addition to "pondering??

(Merriam-Webster online)

Main Entry: 1mull
Pronunciation: 'm&l
Function: verb
Etymology: Middle English, from mul, mol dust, probably from Middle Dutch; akin to Old English melu meal -- more at MEAL
Date: 15th century
transitive senses
1 : to grind or mix thoroughly : PULVERIZE
2 : to consider at length : PONDER -- often used with over
intransitive senses : MEDITATE, PONDER