A weekend that includes 2 or more sleepovers, such as Friday-Saturday and Saturday-Sunday. Basically, one does not go home after a sleepover, but stays as a guest at another's house for the night, or goes to a third party's house. It's rather strange and crazier things happen than the normal 2-day events, thusly deserving the "wtf."
It could even take place on days that aren't part of the weekend (Monday-Thursday)
-So you guys will just come to my house and leave Saturday?
-Yep! We can try to make those banana-peppermint pancakes!
-I can't wait for this WTF weekend!
Something you pull, mentally, when you realize that something that is happening to you, to a friend or some random person is totally crazy
Dude 1: Hey man. You hear about that guy who wanted to date a 18 year old?
Dude 2: No. What about him?
Dude 1: Man is 80 fucking years old.
Dude 2: Damn. Time to pull the WTF alarm on that.