Re:What part of “No, Totally” don't you understand?
by sk5t on Wednesday April 08, 2015 @10:20PM
(#9345491)
I don't think this particular case is a new-ish usage; "filthy" has long been popular in baseball to describe a very crafty pitch or pitcher, or "sick" in music for an amazing solo or musician.
Here's some reading http://www.dailykos.com/story/2014/03/15/1284995/-Origins-of...