LUB
LUB definition by Slang.net - The Slang Dictionary
This page explains what the acronym "LUB" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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LUB (love you, bye) is a quick way to end a text or chat conversation with a loved one. This acronym lets the recipient know that a) you love them and b) you're signing off for now.
If you receive LUB near the end of a conversation, you can respond with ILU2 and some variation of TTFN. This will let the sender know you understood their message, you love them, and you'll talk to them again later.