Short for: you lazy fuck.
Person 1 didnt show up at school.
Person 2 texts: ylf?
Person 1 answers: Yeah I was really tired this morning :P
by Akidon September 17, 2008
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YourLeastFavorite - a well known user on the infamous/famous website tickld.com, where you can spread laughter, cure boredom, and get called cunt a lot
YLF is also the name YourLeastFavorite
by Dookiestew September 02, 2016
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