"Hazzo" is how has to be pronunced the italian word "Cazzo" (Dick) following the slang of Florence citizens.
Instead of "Testa/e" (Head/Heads) in some cases results more endearing using "Testina" (Little Head) or "Testine" (Little Heads). In addiction, "Testina/e" can be used alone also.
It seems that TDH was born in 2006 as a locution and a way to greet inside the Six Bars Jail folk guitar club (www.sixbarsjail.it), from one of the founding member. Usually the term TDH alone is used in public to call someone of the club with some sort of discreetness.
It's not possible to make use of TDH to insult or offend someone but only to joke. The long form "Testa/e di Hazzo" or "Testina/e" must be pronounced in an odd and funny way.
- care le mie teste di hazzo!
- tdh ! venite qua.
- testine di hazzo 'ome ll'era la porchetta?
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)
Mary: "What a bunch of fucking TDH's! They need to get their asses kicked!"