An adjective describing one's intense obsession with or focused interest in hentai; highly specific to hentai, literally a combination of hentai and mental.
"Dude, she is truly hental over that anime porn..."
"I am going completely hental with desire because of this happy hentai."
"I am going completely hental with desire because of this happy hentai."
by Samantha (Boomsass!) October 10, 2006