A "Glue Head" is a person who sniffs or "huffs" solvent and or petroleum based adhesives. Prolonged inhalation of the fumes from these products produces a state of inebriation that some find pleasurable. The downside of this behavior (if you want to call it that) is that it causes brain damage.
Glue heads are easy to spot if you know what to look for. Outward signs that someone is a glue head include: extreme stupidity, slurred speech, general lethargy and a proclivity for watching Spanish infomercials even though they don't speak Spanish.
"That motherfuckin' glue head couldn't find his ass with both hands"