There are two ways you can go about deleting a message: either hold down the backspace button or select all the text and delete it. Now there is one more option for you to choose from. You can now triple tap anywhere in the text field and the message will instantly be erased.
“Triple Tap To Clear” is a free tweak created by iOS developer greensnow. The tweak does not have any option to configure, which means once Triple Tap To Clear is installed, “it just works” (to coin a popular Apple-ism). The only way to stop using it is by uninstalling it in Cydia.
One other thing to mention is that the tweak is only compatible with the Messages application.
Tweak: Triple Tap To Clear
See If Your iDevice Can Be Jailbroken!: http://mofodox.me/jbstats
Follow Me On Twitter: http://bit.ly/ZpjxWx
Follow Me Google+:http://bit.ly/Yybhsg