A kiss that will never normally be happen, but due to the occasion and overall merry-ness, it is given. Generally Used to get the hottie at a christmas party, but sometimes used against one by family.
Toby: Dude, i just christmas kissed auntie jane.
Alan: You're Sick.
Joe: I totally scored sarah!
Simon: Man, It was just a christmas Kiss.
Joe: I hate you.