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1.
A web hacking technique which invloves submitting information to a web script which uses SQL databases (for instance a username/password checking script) which modifies the code of the script to gain unauthorized access to anything from databases to server commands.
That website was too easy to gain admin access to. All I had to do was use SQL injection in the admin login script.
by Powersurge December 12, 2004
 
2.
An unmeaning text that you paste by pressing unintentionally Ctrl+V in a text field.
Hey, what is an SQL injection?'); DROP TABLE users;--
by LittleBobbyTables July 13, 2011