Please inform me of any inaccuracies in my theories. Thank you!
Theory #1
When spelled out phonetically, asdf becomes "ayesdeeef". We can then separate this into "A yes deeef". Now, considering the linguistics involved, the "de" in "deeef" can be turned into a "be", giving us "A yes beeef", which we can then assume means "A yes beef". From this, we get "A yes to beef" or "Say yes to beef". A warning to vegetarians everywhere?
Theory #2
If we translate asdf into Japanese, we get e su deai fuu. This translates into "handle nest encounter seal". From this, we get "Handle of a nest encounter, sealed." Now, a "nest" is generally regarded as a home, so we can get "Handle of a home encounter, sealed." We can assume "handle" means door or doorknob, so we get "Door of a home encounter, sealed." We can then easily rearrange the words to make more sense: "Encounter the door of a home, sealed" or "Encounter the sealed door of a home." "Sealed door" is likely to be a locked door, so "Encounter the locked door of a home" or, more simply, "Find the locked door of a home."
Now, e su deai fuu can also be translated into "painting vinegar encounter seal". The first thing one would think of that upon encountering vinegar needs a seal is baking soda, also known as bicarbonate of soda, so we get "Painting bicarbonate of soda". If we assume this means it is made of carbon-based paint, we get "Painting soda". Translating "soda" to Japanese, we get "so da", which means "that is right", thus getting "painting that is right" or "painting that is to the right".
Thus, find the locked door of a home, and there will be a painting to the right.
Theory #3
If we take asdf and stick a 2 after each letter, we get a2s2d2f2. a2 is a well-known musical term meaning "all together". s2 can be made into s^2, which is the formula for a square area. d2 is half of the robot R2D2's name. f2 spelled phonetically is "Eff'd you". We can assume "Eff'd" is a verb because of the "'d". One such verb would be effaced, meaning to wipe out or erase. So, we get "all together, square area, robot, effaced you". By "you", we can assume this means the human species, so we get "All together, square area, robot, effaced human species" or "All together in a square area, robots effaced the human species. An eerie prophecy, indeed...
Once again, these are my first, so please let me know if any adjustments need to be made!
--Mihara-pyu, asdfholic