This is an anagram for the phrase shouted from one knowing fixie skidder to another, when spotted in urban landscapes.
It illustrates to the remainder of the general public that you are a member of the elite London cycling squad LFGSS and makes them all super jealous.
2) bob: an adapter plate for a threaded headset.
1) Joe: the fucking traffic!!
2) bob: I know, i think it is das subway car blocking the thruway
When somebody is average looking, but when you find out they can dance, they suddenly become very attractive. DAS usually affects dancers, where other dancers suddenly look very hot when they you see the way they move.
Lisa: I didn't notice him until he started dancing. Oh my god, major D.A.S.