No. The DS is not a modern system with security and levels of operation, and nobody puts debug stuff like that in commercial hardware when you are building down a price.
You can insert things into code to see what is going on, the supercard dstwo and ismm will allow you to view memory and find cheats, datel made cheat finding devices which will allow some measure of debugging and there are a few other things you can do (do note you can also run cheats on commercial games with things like nitrohax). With that said no$gba debug is fast, pretty accurate and free with capabilities far in excess of anything you will get in hardware http://problemkaputt.de/gba.htm .
While I know you mean in case of someone confusing schooling establishment from shooting establishment (many of the same letters) I am still going to read that as lockdown (also known as lock in) for a pub
being drunk in school was either because drunk on playing field or could not be arsed with one particular Thursday afternoon so went and had some beers and played some games instead before returning for an ill advised last lesson/period