1. A D.J. of insignificant, meretricious, or shoddy skill; in particular, one who implies a pretense of higher artistic value and caliber than their actual skill warrants (see David Guetta);
2. Any performance of a DJaster, used in the same way as "disaster";
3. Any performance of a DJ that was inferior to their normal performance, usually attributed, whether correctly or not, to equipment-related issues.
While spelling variants occur (e.g., D'jaster; D-jaster; DJ'aster; DJ-aster) 48 out of 50 Usage Experts agree that DJaster is the proper spelling. The other 2 are usage-expert-asters.
Because of the connection to an obscure word that commoners would have little connection with, it is undoubtedly the case that usage #3 will soon take precedence over usages #1 & 2; however, careful writers and throwers of Shade should refrain from using it in this lesser form and continue with its more refined traditions.
2. "I went to go see DJ Charlatan last night."
"How was it?"
"It was what I expected it to be: A DJaster."
3. "My set was horrible! The needles kept messin' up, my Traktor wouldn't communicate with the control records, the mixer fader had a short in it . . . A complete DJaster!"