Wiktionary
ytf
init. (Internet slang) onomatopoeic abbreviation of "Why the fuck".
Wikipedia
YTF (disambiguation)
YTF is an acronym that may stand for:
- YTF Legacy, originally just YTF, an American performing group
- The International Air Transport Association airport code for Alma Airport
- The Youth Tennis Foundation of Florida
- Yttrium-iron garnet Tunable Filter