Someone Who Isn't Me. Common term on drug-related forums. Typically because forums don't want people talking about their own drug use, presumably for liability reasons.
Sort of like phrasing an interview question like this:
"First let me say we don't do drugs tests AND it does not look like your doing drugs right this second. Now, with that in mind are you currently... "
"By currently you mean right this second?" "Yes"
"Well then no."
Sure, both sides knew the correct answer to that question, but the desired box was checked.