Recently, I once again came across a Shia allegation regarding Hadhrat Muawiyah (r.a) that he had a big belly. I was surprised that Shias also use this argument to defame Muawiyah (r.a), whereas one of their eminent scholars 'Taqi ud Deen al-Halabi' wrote a book titled الدرر الثمین فی اسرار الانزع البطین
The literal meaning of this book is
'Precious pearls regarding the Secrets of the bald and the pot-bellied man'
The Shia translator of Kitab al-Ghayba, Abdullah Shaheen has translated الانزع البطین as "the bald, potbellied man", and in the notes the name of Imam Ali (r.a) is mentioned.
http://alhassanain.org/english/?com=book&id=903
How strange is it that their own Imam was bald and potbellied, and they have the courage to make fun of others.
(http://mtif.org/thumbnail.php?table=pic&full_size=1&id=1304)