GLWT
GLWT definition by Slang.net - The Slang Dictionary
This page explains what the acronym "GLWT" 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 someone thinks you've bitten off more than you can chew, they may wish you GLWT (good luck with that). This acronym is often used sarcastically, when the sender believes you have no chance of accomplishing a task, no matter how much luck they send your way.
If you believe the person who sent you GLWT meant it sincerely, you can respond with thx or TY. If you believe they meant it sarcastically, you can respond with watevs or weva (and maybe tell them to stop hating).