To make such a word, you first have to take something which relates to teens, say... you use the word "reflexes" for instance. Then you take said word and redefine it into "wii-flexes" and of course you write something positive about the word aswell like "Ungodly reflexes possessed by a wii-player" and there you go!
Now you have a new and kewl word which is likely to be picked up for a bit by all the players of the wii console and redistributed since it's now a fad. Also, you now also have a free advertising channel in the urbandictionary aswell.
dude2: I dunno, beats me.
*marketer2 from the word wii-kend strolls by*
Marketer2: Hello, this is a Wii-lly FANTASTIC day guys! take a Wii stroll out and enjoy the sunshine, it's Wii-kked!
*both dudes look at him like he's crazy*
Marketer2: whaat? you don't like my wii-ral advertising campaign? it's the best! and FREE!
*both dude1 and dude2 simultaneously pull out guns and shoot the moronic marketer2 dead on the spot*
Dude1: yeah, so.. uhm, wanna play some Wii at my place?
Dude2: sure, but please don't use any more stupid Wii words alright?