A crease is when somebody purchases a new pair of shoes (usually very expensive ones) and then bends the nose of the shoe upwards (usually happens when raising your heel upwards), causing the shoe to form a crease where it was bent. This is considered dishonorable or disrespectful to the shoes as it leaves a permanent and obvious mark.
"Hey did you hear about Jeff's new shoes?" "Yeah, did he crease 'em yet?" "Yeah, he just bought them this morning too!"
Something you yeet into your xbox one and play for 999 hours