Hot Linked

An item on one web-service that is requested by another web-service, usually an image. This isn't when an image is actually a potholed link.

This is not only impolite (it eats up your victim's bandwidth), it's almost always a really bad idea. A Hot Linked item may have been removed by the original host (this is a big problem with YouTube links). The original host can be undergoing a performance problem. The original host may have changed its linking policy. The original host may be gone. The original host may have substituted a different (and often obscene) image for the one at that URL ... The list of possible badness goes on and on.