W4U
W4U definition by Slang.net - The Slang Dictionary
This page explains what the acronym "W4U" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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Someone who sends W4U plans to "wait for you." You're most likely to receive this acronym when you're late for a meeting with a friend, family member, or colleague. It lets you know they're willing to wait for your late self.
If someone says they'll W4U, you should respond with TY or some other acronym that shows your gratitude. You may also want to let the person know you'll arrive ASAP - so they hopefully won't have to wait around much longer.