Getting grounded from the family computer.
"That's it, you are under mouse arrest mister!" - Your mom after discovering your pornfolio
2 more definitions
Mouse arrest begins when your cordless mouse batteries die and ends when you get off your fat ass and get more batteries.
I was about to frag that n00b from behind all sneak-attack style but then I entered mouse arrest.
The state of being stuck at your computer, to answer endless emails for example.
Sorry I missed lunch; work had me under mouse arrest.