Werk
1) Verb: the act of jerking off at work, used in a sentence where you pretend to have been really working.

2) Noun: the action of werking

Can also be used if the work implies jerking a lot, for example porn acting.
1) Jason has been werking off all day! There aren't any kitchen towels left and the article will probably be out tonight!

2) Rocco Siffredi's career demanded a hell of a lot of werk to get to where he is now.