wilfing (noun)
browsing the internet with no particular purpose
The time-consuming practice appears to have destructive effects too: a third of males admitted that wilfing has a damaging effect on their relationship with a partner.
(Submitted from the United Kingdom)
What impresses me about the sample sentence above is that a third of males admitted that wilfing has a damaging effect on ther relationship. I reckon the other two thirds are in denial. Ha! Kidding … kidding. Seeing as it’s Gender English month on the blog it seems like I might get away with suggesting that wilfing could be tied into the ‘new shyness’ and the ‘arousal addiction’ that Philip Zimbardo speaks about in his TED talk: The Demise of Guys?. This seems like a sexist post now, and politically incorrect, it’s not. It’s an interesting TED talk, worth being added to your wilf list.

This is a verb
In this instance the term is referring to the activity itself, cf:
http://www.macmillandictionary.com/buzzword/entries/wilfing.html