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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)
Jenny: "What are those guys going on the corner, drinking and insulting people for no reason?"

Mary: "What a bunch of fucking TDH's! They need to get their asses kicked!"
TDH by N0tMyRe@lName February 17, 2010
TDH by SSnipes January 14, 2020
a well known blackhat hacker who goes by the pseudonym of "tdh". tdh penetrated doxbin.org and 0x0539.net in early 2021
Guy1: omg doxbin got pwned again...
Guy2: by who?
Guy1: that hacker called tdh lol
tdh by sdfdsgdfhgdfshgdfhjsdfha October 2, 2021
girl, get yo ass over here, TDH!
TDH by JimmyTheN May 1, 2022
Test-Driven Hyperactivity Disorder. A developer's inability to concentrate on the needed design (e.g., for a web application) because s/he's frantically hopping back and forth between testing and coding a minimal example. Often seen in Test-Driven Design and Behavior-Driven Design exercises.
In a frenzy of pair programming and TDHD, Alice and Bob have managed to reach a local maximum (i.e., sweet spot) in their web application's design. Unfortunately, the global maximum design is totally different and basically unreachable by any rational amount of refactoring...
TDHD by ClojureDoor September 19, 2013

tdhnkkuhfgkudrjgisnkvuhgoijersoigjxkfjblod 

its a word that tom doesnt understand

silly tom
hello that is a nice tdhnkkuhfgkudrjgisnkvuhgoijersoigjxkfjblod

i like your tdhnkkuhfgkudrjgisnkvuhgoijersoigjxkfjblod today

have u bought the new tdhnkkuhfgkudrjgisnkvuhgoijersoigjxkfjblod?