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1.
1. Over dramatic and obvious statement spewing.

-Commonly associated with the movies and actors of the Hallmark Channel.

2. An over dramatic person
"My Dad was acting very hallmarky today after watching the stock market drop and continued to act the same when he switched to the Hallmark Channel."

"Be careful, It's cold." (From a Hallmark movie in which a man jumps into water while it's snowing and the women screams the above statement.)
by Rob MJ December 06, 2011
 
2.
Saying something so sweet that it sounds like it should be in a hallmark card.
Woman: I just saw your weather and blew you a kiss, the wind is blowing from up here down to you.

Man: Awwww....wow....that was very Hallmarky....And Incredibly sweet.....I love you
by djodyb April 13, 2012