Definitely not a font.

Looks hand-drawn. Some similarly sketchy fonts:

Denne Sketchy (free)
FFF Tusj (free)
Infilto
Karabine (free)
Scratch Bold (free)
Sketch Block
Sketch Rockwell (free)
Skicack
Skratzy
Urabn Sketch (free)

Here's a tip on replicating the style using of any font:
http://vectips.com/tutorials/turn-any-font-into-a-sketch-font/

Yipyop - thanks for the tip link - worked so awesome for me... I'm in scribble heaven

Mark