The quality of being calm and even-tempered. Composure. Occasionally related to phlegmatic. Sometimes related to Ryan Gosling. Usually not related to redheads. Always related to Roger Federer (even in angry moments).
This excellent video from Vox explores how rappers create the rhymes in their lyrics, including why "Lose Yourself" is such a terrific example of the genre and why MF Doom is the truth:
Note: lyrics and audio NSFW
I'm not sure I'll ever be quick enough to pick up all the rhymes at first listen or read but this gives all of us clues of what to look for as we listen. And forsooth, MF Doom is the truth.
VideoHip-HopLyricsRhymesDropping hot fireMF DoomVerbal dexterity