Definition-Is a form of light poetry usually with a nonsense or humorous theme. It has 5 lines

Line 1-7-9 beats with 3 stresses                           A  

Line 2-7-9 beats with 3 stresses                           A

Line 3-4-6 beats with 2 stresses                           B

Line 4-7-9 beats with 3 stresses                           B

Line 5-4-6 beats with 2 stresses                           A