BYKT
BYKT definition by Slang.net - The Slang Dictionary
This page explains what the acronym "BYKT" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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Cheeky texters and chatters use BYKT to mean "but you knew that." This acronym signals that, whatever the person you're chatting with sent you, they think you already knew or should have known.
For example, your SO might send you a reminder that your anniversary is tomorrow and end the message with BYKT. This is your SO's way of saying "... or at least, you better have already known that ..."