When a couple kisses each other with closed-mouth pecks, repeatedly, moving their head forward quickly each time. Commonly done by middle schoolers or high schoolers, when they don't know how to make out
*two kids walking through a school hallway see a couple pecking each other's lips*

Kid 1: Ugh. It's so gross to see people do that

Kid 2: Yeah. I hate to see people chicken kissing.
by Holy Houdini September 14, 2015
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or Cloacal Kiss, refers to the way birds reproduce. The male and female press their cloacae ( the plural form of cloaca - the opening that a bird uses for waste and reproduction) together to fertilize the female bird's ova.

Also a slang term for vagina-to-vagina or anus-to-anus intercourse (see Fish Bump)
Aww, sick Chicken Kiss! Looks like Bessy's finally gonna lay.
by FreddyFwaygaux August 2, 2018
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