I would consider a dumpy mofo to be a person who is not only a mother fucker (mofo) but also quite dumpy. HOWEVER a dumpy mofo does not have to be on welfare or techinacally fuck a mother. A dumpy mofo is someone who is quite grubby and for embellishment you add mofo at the end.
by Pookiegirl June 27, 2013
Slang used to describe sexual activity involving oneself's anal cavity especially if the receiver is rather large from behind. Typically the posterior-end is referred to as "dumpy" which is due to roots within the word "Dumptruck" (which is a vehicle commonly used to haul large quantities of sediment from one location to another), and the word "bumpy" being used to describe the motion of anal sex where one bounces off of their partner.
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