On the internet - To view a full size image linked from a thumbnail or smaller image.
"Click to embiggen" or "Clicky to embiggen"
adj. generic superliative. could mean anything prositive.
superb throw that embiggens both the player and the viewer.
to get a boner upon seeing something you are sexually attracted to
dog: woof woof
toby: fuckiin hell that dog embiggened me!!!
To embiggen something is to make it bigger. You take an item that is wee and add more jpeg until it becomes bigger.
His sweet song embiggened my heart, and now I can’t stop crying.