phat is a play on the word fat. however, given the etymology of the word, we see a broader (phatter) meaning of the word. the ph is derived from the pH scale, which, contrary to dumbass belief, goes from 0 to 14. Now, since 0 comes first, it's where you start--it's the bottom. So, it goes in the denominator. Thus, you have (14/0)= ∞. Infinity represents how phat the ass is--infinity big. Also, the ass looks like a ∞ sign. Need i say more?
by ihatezucchini October 22, 2018
Get the phatmug. 
Get the PHATmug. a:wish i could afford a phat
b:if you kill green drags for the rest of your life you will be able to!
a:yay!
b:nerd.
b:if you kill green drags for the rest of your life you will be able to!
a:yay!
b:nerd.
by baleeta April 8, 2009
Get the phatmug. adj.
1. Of great magnitude.
2. Attracting special attention.
from the English "emphatic" from the Greek "emphatikos"
1. Of great magnitude.
2. Attracting special attention.
from the English "emphatic" from the Greek "emphatikos"
by krodamai December 28, 2005
Get the phatmug. by kiwidontstealmytoiletpaper July 1, 2020
Get the phatmug. 
The term “phat” is used when a female’s bottom is thicker than thicc, on the thicc scale the word “Phat” is above Thiccc. “Phat” can also be used as “Phatty”, that term is used when the words “Phat” and “Ass” are used together to create one word.
by AsmodeusIsCool June 23, 2018
Get the Phatmug.