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an affectionate way of how someone might refer to their "significant other", usually in the presence of that person and others.
"I'm a vegan...but THIS one here loves his sirloin!"
by Holly August 26, 2005
A phrase used by submissives in the BDSM relationship to refer to themselves when they have been forbidden to call themselves 'I'
"This one has been a bad girl."
by AlabasterR May 27, 2007