A green penis like creature in the video game Minecraft that gains pleasure out of destroying hours worth of building by self destructing. Before it explodes it let's out a "sssssSSS" noise that resembles a fuse being lit.
In other words if you hear "ssssSSS" Run like fuck.
Creeper: "That'sss a nice houssssse you got there. It would be a sssssshame if something happened to it. ssssssssssSSSSSS