"I am on the EDGE of my seat!"
"This game is not very EDGEucational, is it?"- The Chatroom
EDGE! is a running gag that first appeared during Fraser and Becky's playthough of Catherine. A large part of the gameplay in Catherine involves pushing the blocks of a tower in order to climb them and reach the top. Part of the game mechanic is that as long as a block is touching the edge of another block, it will not fall.
Whenever the player pushes a block and that block connects to the edge of another block, a female voice says the word "Edge" to remind the player of this mechanic. With the word being repeated so many times, it quickly became the subject of many jokes and puns, starting at part 4 of the episode.