My it's Acid and that has a bit of a story (but to make it short) it refers to the way my first best friend and I used to talk meaning in an acidic form (this roughly traslates to saying what you meant disregarding the consequenses) basiclly "say what you mean, mean what you say" dilema and I still wear it as a title (and very proud of that, even if he betrayed me in the end) is my way to remember the good times and how he help he out.
The K was meant to say ok but instead I choosed just k and 44 IDK, I really do not know.
So Its like this Acid-K-44 (Acidk44) most people have a hard time pronouncing it so I just say call me acid.