U
u definition by Slang.net - The Slang Dictionary
This page explains what the abbreviation "u" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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U is a popular abbreviation for "you" that many people use in texts, online messages, social media, emails, and even some company names (does a certain moving truck company ring a bell?). For example, your buddy may text you, "U up yet or r u still passed out?"
The abbreviation gained prominence as mobile phone usage and online messaging rose dramatically in the late-1990s and early-2000s. People may use it individually or as part of another abbreviation or acronym, such as CUL or WRU.