noun. Any of various grasses of the genus Poa, having bluish spikelets, including species such as Kentucky bluegrass that are used for pastures and lawns and others that are considered weeds.

noun. A type of country music that originated in the southern United States, typically played on acoustic stringed instruments and characterized by rapid tempos and jazzlike improvisation.

noun. Kentucky bluegrass, Poa pretensis.

noun. A style of country music with roots in Scots-Irish Appalachian folk music, blues, and jazz. Characterized by banjos, fiddles, and mandolins, but containing no drums.

"Their bluegrass is very widely defined, and we were about to set out on tour when I said, "By the way, can you do this?""