Abbreviation for "Teenage
DickHead." - a large subset of teenagers, almost always (99.9%) male, who enjoy acting like idiots, being obnoxious, and making fun of people for no good reason.
It is speculated that these teens have contracted a viral illness called "teenage dickheaditis," which can be caught as early as 13 years old. The infection clears by age 25, if not sooner.
Sometimes a really good
ass-kicking will cure the infection spontaneously.
"Teenage
DickHead.... its only Teenage DickHead.....
Their all DickHeads!" (song parody)