A hallmark moment is when you have a moment that would be perfect on a card. It doesnt matter if its funny or not, it just has to be card material.
"When you tripped I laughed and thought how that was such a hallmark moment"

"Ewww did you see the new chick? She had such a hallmark moment in science."
by juliett May 19, 2009
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An act so improbable it looks staged. Like on a greeting card.
Hallmark moment peanut butter staged
"I thought he couldn't stand her. Now they're standing close and sharing his peanut butter."

"Yeah. They're having a Hallmark moment."
Hallmark moment peanut butter staged
by Yasmeen10 July 1, 2012
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