1) Someone who is tends not to stand up for themselves but will run to someone else for help. In other words, a grass.
Usually hated by most people and when in certain situations, will cry and generally annoy everybody in the area.
2) Someone with a small head.
Example 1
person1) Hey, look at that guys abnormally small head.
person2) Haha, yeah he's got a Dan B.
Example 2
person1) Stop crying poof face, your such a Dan B.
person2) lol
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.