wtf

Short definition from Wiktionary

Phrase

1. 1
   Alternative letter-case form of WTF.
2. 2
   Initialism of what the fuck.
3. 3
   Where the fuck, why the fuck, when the fuck, or who the fuck.

Proper noun

1. 1
   Initialism of World Taekwondo Federation.

Noun

1. 1
   Initialism of White's tree frog.
2. 2
   A bafflingly bad or unwise design decision.