Create a WordPress shortcode
Creating your own custom shortcodes is another thing that WordPress makes very easy to do.
Add this to your theme’s functions.php
file:
function i_love_you() {
return 'I love you.';
}
add_shortcode('luv', 'i_love_you');
Then to show some love anywhere in your posts or pages, just type the following shortcode:
[luv]
Much more is possible, visit the WordPress Codex for more infos.