look up any word, like blumpkin:
 
1.
When a video or image looks better in its thumbnail than it does full sized.
Person 1- "Hey, did you see that video I posted on YouTube?"
Person 2- "Can I be honest with you?"
Person 1- "Okay..."
Person 2- "That video had great thumbtential... But it was horrible."
Person 1- "Oh."
by open_minded January 11, 2014