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internet term, stands for "you lying sack of shit"
guy1: did you have sex yet?
guy2: yeah
guy1: o'rLy?
guy2: hahahaha no
guy1: YLSOS
by milFRO September 28, 2006
9 2

Words related to YLSOS:

crc ftrw gofl ftp fufunu milf mofl o'rly? yaaff