A limerick is a silly poem with five lines. They are often funny or nonsensical.
How to write a limerick:The first, second and fifth lines rhyme with each other and have the same number of syllables (typically 8 or 9). The third and fourth lines rhyme with each other and have the same number of syllables (typically 5 or 6). Limericks often start with the line "There once was a..." or "There was a..." Example of an 8,8,5,5,8 syllable limerick:

-There was once a boy named billy
-This kid would act very silly
-He would eat apples
-He drinks a Snapple
-He would always have company