The action of holding one's hands up and erratically flicking or wiggling all of their fingers about at a very fast pace. Used to display excitement or fear.
Examples of situations in which a person would employ crawly fingers:
While feverishly masturbating you loose your internet connenction and are forced to crawl around on the floorlooking for any kind of material to help you finish the "job"
my power went out and i had to do an angry crawly lastnight and all i found where family photo albums
Horny Guy: "Dude, I bet you $20 I can fuck that girl by tomorrow"
Horny Guy's Friend: "I hear she comes with the creepy crawly crabs package, you sure you wanna tap that?"