Limericks are defined as nonsense poems made up of five lines that are witty or humorous.
A Limerick should follow the convention below:
Lines 1, 2, and 5 of a Limerick should have seven to ten syllables and they should rhyme with one another.
Lines 3 and 4 of a Limerick should have five to seven syllables and also rhyme with each other.
The lines should have a strict (aabba) rhyme.
The first line of the limerick usually introduces a person and a place. The place name establishes the rhyme scheme for the second and fifth lines.
In Older Limericks, the first and last lines were usually the same.