garbage head n. an abuser of illegal narcotics who will try anything in order to get high. Editorial Note: The 1961 Heinlein cite is probably a nonce usage of garbage head unrelated to the definition given here. The typographical errors in the 1973 citation are consistent with the original printed article. (source: Double-Tongued Dictionary)
In my novel, titled Garbage Head, I use the phrase to mean
“A person who repeats (or in this case peats) the garbage on television and radio.”
It’s like ingesting anything, but from a mental/media perspective.