OED's word of the day

is bootylicious, first documented in 1994. Now I understand meaning #2, "Esp. of a woman, often with reference to the buttocks: sexually attractive, sexy; shapely." But what about meaning #1: "Of rap lyrics: bad, weak. rare"? Is it really an insult for a rapper to tell another rapper that his rhymes were bootylicious? The statements it gives in context seem ambiguous to me. Can someone who knows something about rap clue me in on this?