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1.
verb (middle-naming, middle-named)

used to describe the act of calling someone by their first and second names, usually to repremand them.
Did you get in trouble for last night?
Yeah, I even got middle-named.
by Stefanie January 18, 2005
 
2.
Your second name usually used if your first name sucks or if you move to a different country and your first name sounds stupid in there language
Example Middle name - Yuri sounds stupid in spanish so i went by Alfredo and Alfredo sounds stupid in English so i go by Yuri
by Alfredosauce97 June 24, 2011