Permissions level for a file in UNIXwhich allows anyone to read, execute, or write to that file. Simply put - any schmoe can look at and change the file. A bad idea if the file is, or may someday become, even remotely important or senstive.
Executed at the command line as "chmod 777 <filename>"
"Have you gone mad, Carl?!" Thad screeched, "'chmod 777 /etc/password 'is like walking into Compton buck naked, covered in swastikas, with hundred dollar bills taped to your dick!"