TBY
TBY definition by Slang.net - The Slang Dictionary
This page explains what the acronym "TBY" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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When you receive a message that contains TBY, you'd best stop goofing off. This acronym stands for "teacher behind you" and ... why are you still reading this? Put your phone down! Click away! Quick, before your teacher sees!