I second that motion: my favorite example of "playing dirty" is Zakk Wilde, song "
Speedball".
Playing an instrument is an
art, and art is defined as "it's all good, unless it isn't." If it sounds good, keep it; if not, practice harder.
I'm a newbie player myself, so my playing is always unintentionally messy. Sometimes it sounds OK, but when I'm practicing, I try to play precisely. If I can get that down, then I'll be able to re-insert some dirt with some degree of reliability and "art".