A limerick is a humorous poem consisting of five lines. The first, second, and fifth lines must have seven to ten syllables while rhyming and having the same verbal rhythm. The third and fourth lines only have to have five to seven syllables, and have to rhyme with each other and have the same rhythm. A limerick is a form of poetry in five-line, with a strict rhyme scheme (AABBA), which is sometimes obscene with humorous intent.