Wikiwalking is a speed game which two or more people can play on Wikipedia. They choose a start page and an ending page. The first one to the final page wins that round, and normally you play the best two out of three.
The act of searching lewd acts on Wikipedia, and masturbating to the descriptions and textbook diagrams, primarily because you're incredibly horny and porn sites have been blocked from your computer, or maybe that's just what gets your rocks off.
Jonny's parents assumed installing a parental control block on his computer would keep him from spending all day on blowjobwhores.com, when in fact all he had to do was search "fellatio" on Wikipedia, and commence Wikiwhacking.