1. Acronym standing for 'ass shit da fuck'.
2. Four letters on a QWERTY-keyboard that are in a convenient row, and are thus easy to type for the purpose of spamming, receiving attention or expressing anger.
1. Guys, this chat is dead asdf asdf asdf...
2. No I lost! asdf asdf asdf asdf...
Expression used as a placeholder for a variable name in the interest of minimizing time spent naming, as well as to minimize the time elapsed mechanically actuating the keys of a QWERTY keyboard whilst using the left hand positioned in the home row of the keyboard. Often considered to be a negative code smell and associated with sloppy programming. Patent pending.