WTF is an internet acronym meaning 'What the fuck?' It is a ruder version of 'What the hell?' and is used when the situation becomes weird or disturbing, e.g. a strange picture or video. It can extended to "What the fuck is this/that?" as well as other phrases (e.g. "What the fuck are you doing?" and "What the fuck is wrong with you?") of course, with this acronym it would be written as "WTF is that?"
Similar words and phrases:
- What the hell
- What the heck