Abbreviation meaning "Too stupid to die" referring to the creation of media depicting acts that are extremely dangerous for the purpose of entertainment.
We made some tstd vids trying to swim in a pool with an hairdryer in it.
A hardo is a person who tries extremely hard at everything. Most times a hardo will try very hard at things that do not require excessive effort. For example, sports practices, gym class, etc.
Wow did you see Jack at practice today? What a hardo!