Superlative combination of sincerity and sentimentality. Abundance of enthusiasm or excitement. Usually one-sided, always over-the-top. Can be misconstrued as meretricious in nature, though that's not usually the case.
"Strangers with that kind of honesty make me go the big rubbery one" Narrator, Fight Club
ABB: Shut it. Don't make me bitch-slap the stupid out you. I friggin' hate it when you're schmaltzy like that. Jeez chri, you're not going gay on me are ya? I told you I'm not like that. Anyway, you're welcome. Now show me what you really learned about STFU.