Do the Amber

To sit (usually with legs crossed) in the middle of the street or on the ground with head turned to one side (usually the picture taker's left) while pretending to be happy or laughing.

Classic Amber locations would be under a bridge of some sort with oncoming cars or on train tracks.

"Hey, can you teach me to do the Amber?"
"Quick! Theres no cars coming, do the Amber!"