Top Definition
the time that a typical rock show starts. This can be useful to indicate to people when to come to a show, but also to indicate that it's kind of not specified (and will most likely start late). Obviously it's somewhat subjective and will change depending on location. If all bars close at 2AM, for example, rock-thirty is probably around 10:30-11PM.
wannabe groupie: Oh, you're playing at the club tonight? what time?
guitar player: rock-thirty, baby.
wannabe groupie: oh, that's kind of late for me, but have fun!!
guitar player: yeah, whatever.
by zha troof July 01, 2010

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