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1.
A name for someone who likes Japanese comics beyond all reason. Mixture of Manga and Mongoloid (someone with down syndrome. Often used by Weeaboo haters.
Normal person: So, you like that "Mainga" shit?
Manga Lover: It's pronounced Mon-ga.
Normal person: Only a Mangaloid would know that.
by Thomas J. Kirk June 18, 2010
 
2.
Combination of mongoloid and mangled.
Man, that bike got so wrecked its mangaloid.
by KrisD22 August 26, 2009