1. The "Weird As F***" Disease
2. When someone has no social graces 3. When someone never filters what they say and think they're being funny, but are just making everyone else uncomfortable and feel really awkward.
"Amanda is weird as f***, she's got that WAF's disease!"
"Amanda's WAF's went crazy the other day and she started talking about her addiction to video games...it was really embarassing that she wasn't embarassed."
Most properly used when texting or posting on facebook, or perhaps verbalized as "W-A-F-D" when kids are around or in an extremely "proper" situation.
On facebook: "Hey fb fam, went to Best Buy on Black Friday and was waiting 45 seconds for some dude to pull out of a parking spot when some rich asshole pulled his Bimmer in before me. WAFD!"