Green’s Dictionary of Slang

(US) sycophantic, insincerely affectionate behaviour.

1889		Nat. Police Gaz. (NY) 28 Dec. 3/1: [headline] love rampant. / Cupid Plays Kissy Kissy and Huggy Huggy / allee samee last week. / Naughty Girls’ and Susceptible Boys’ Tricks [...] Cupid [...] never appears to be happy unless he is tearing hearts all to pieces.
1981		Peyser & Peyser Sarah McDavid [film] A little kissy-kissy and you’ll be... [promoted] in a minute [HDAS].
1984		L.A. Times 20 Dec. V 1: The eating, schmoozing, chatting, wheeling, dealing, kissy-kissy and critiquing following the film [HDAS].
2005		D. Manning Korah System 34: They are ‘kissy, kissy, kissy’ at first, hoping to bring the new pastor under their control.
2010		L. Redhead Thrill City [ebook] Don’t believe all the kissy-kissy stuff, it was just for the cameras.