adj. used to describe something cute, adorable, attractive, etc.
"Oh! That store looks fun!"
"Her shirt is fun!"
(geek lingo) "lawlz" is "lol" when it's read out-loud (the "z" just making it not sound like you're an r-tard).
*should only be typed unless not being used seriously when spoken*
"lawlz! he said what?!"
"lawlz, what a nOOb."