ur

It's possibly one of the most multi-purpose abbreviations for Internet use: "ur" can mean either "you're" or "your." For that it deserves admiration. Yet it evokes other heinous distortions of the language such as cutesy spellings ("lite" for "light"), inappropriate uses of quotation marks, random capitalizations, unwillingness to ever capitalize, etcetera [shudders]. If I ever actually use "ur," just know that I am having a Flowers for Algernon moment.