It's a physical reaction that a person has when they get over stimulated or excited when typing, often when someone is in the act of Instant Messaging. It causes the typer to make several mistakes and become flustered, eventually just feeling exhausted and unable to continue typing.
Jen: What happened when you were talking to Craig in the chat room?
Cheri: I got so excited that I completely keygasmed and finally logged off.
A Shackteau is a humble, weather-beaten, structurally questionable shelter located in a spectacular or highly coveted place—Wales, Jackson Hole, Sun Valley, Crested Butte, coastal Maine, the Alps—where the building itself may be worth almost nothing, but the dirt, view, access, and mythology make it absurdly valuable.
In use:
Shackteâu - We thought it was an abandoned shed until the realtor called it a rare alpine Shackteâu with unobstructed views and listed it for $2million.