Dave Mustain is the very talented Guitarist and lead
singer of the heavy
metal band Megadeth, he is otherwise
notorious for getting kicked out of the band Metallica in his early days because
of his unhealthy behaviour. Among amateur rock musicians, likening a band member to dave Mustaine means that they
are unprofessional and that their
general attitude impedes on the overall quality of the band, because they
can't walk the line
for example. Note that
the real Dave
Mustaine is a musical genius (regardless of his other problems), but a "Dave
Mustaine" doesn't have to be particularly talented.
-Hey Slash, how's your band?
-It's O.K., but our lead singer is a fucking Dave Mustaine! We probably wouldn't keep
him if he wasn't so talented.
-Oh, he is good? So he is like a real dave Mustaine then!