A person with rhyming abilities comparable to those of the famous children's author, Dr. Seuss. While this term is most commonly associated with professionals in the field of freestyle rap, a true Souss can rhyme any two words together in any setting, even if new words have to be invented to suit the purpose. These people are often called lyrical wordsmiths due to their ability to "forge" words into perfect rhymes.
-O shit! He just rhymed "esophagus" with "sarcophagus"!
-I know, dude! This new rapper is such a good Souss!