The fit your body goes into after having discovered you are walking through a spider web, instantly turning you into a ninja with the ability to scream higher than Mariah Carey.
Erika went into Arachnoleptic Shock whilst walking through the trees, shrieking and flinging her arms around like Samurai swords to ward off sneaky spiders.
Steve: "Is Erika fucking breakdancing?
Erika: "EEEeeeeeeeek! Spiders attacking!"
Amanda: "Nooo, she's in Arachnoleptic Shock, fucking spider webs sneak up on you!"
Spider: "Scream louder bitch!"