fattam Share definition Flag A nickname for someone who is, pimpin, gangsta, awesome, and is great with people.nickname for a pimp, or an awesome person wow, he's such a fattam, look at how he's nicely treating those people! fattam by Adam Fallon March 5, 2008 0 0 Get merch Get the fattam mug. Buy Now — $32.95 See more merch