1 School and College Ability Test
2 supersonic commercial air transport

1. Singing jazz; the singer substitutes nonsense syllables for the words of the song and tries to sound like a musical instrument; SYN. scat singing.
2. An animal fecal dropping

1. To go away quickly
2. To move fast; scoot
3. To improvise nonsense syllables usually to an instrumental accompaniment; sing scat