Here is an example from the comic GANTZ. (This should be fair use of the image at least in the US as it's for scholarly commentary.) It's easy to tell that emphasis is being added, and the speaker is marveling at what happened, but it's not clear what it expresses exactly.
1 Answer
「やんの」 = 「やがる」 + 「の」
It is attached to the て-form of a verb to express one's contempt or disdain for another. It is also used to make fun of a person or his/her action.
"The fool did/is doing (this or that)!", "Watch that a**hole do ~~!"
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2Right, it is the Kanto tough guy speech.– user4032Mar 30, 2014 at 11:25