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1.
A portmanteau of "Japanese" and "cartoon" which refers to animation from Japan, or anime. "Japtoon" originates from the anime blog Colony Drop, and is a play on the phrase Japanimation, which also refers to anime.
Mobile Suit Gundam is one of my favorite Japtoons.
by Sean Crowe July 31, 2011
 
2.
Anime, or any animation coming from Japan or modeled after Japanese animation, usually used in disgust of the subject
I would stay up and watch Adult Swim tonight, but i just remembered it is Saturday and the only thing on is the damn Jap Toons!
by ILwolfe November 28, 2010