Echo!

Echo! is a line spoken by Custard in the children's show The Save-Ums. Due to the use of the word "echo" and the way the line was delivered, it would become a popular in-joke (and a YTPMV source) in the Save-Ums fanbase.

Origin
The line was originally featured in the 33th Save-Ums episode Lost in Rock World. The episode was one of the Save-Ums episodes to feature profanity, most evident in the constant use of the word "echo." In one scene, during the search for Elizabat, Noodle, Custard and Colin find two tunnels which way they can go. Noodle says that it will take too long. He says "Let's think" that echoes. Custard then yells out "Echo!" (which will be widely parodied after the episode release) which shocks Noodle and Colin, and says "Sorry, I couldn't resist. I love echoes!".

Spread
In the years following the episode release, Custard's line became mocked within the Save-Ums fanbase. On October 7, 2018, Luna Minami uploaded two parody videos: One is Get Echoed!!! (shown below, left) and My name's not Echo! (shown below, right), featuring Custard's line.