1. Something that is cool

2. A person (any size) who is eating alot.

3. A fat person.

4. A woman with a large but attractive ass

5. A erected penis
1. "Thats fattie/fatty as fuck mate".

2. "Oh my days, you ate all of that, you fattie/fatty!"

3. "Look at that fattie/fattye."

4. "Check out that fattie/fatty."

5. "Mate, Bob got a fattie/fatty over Aleesha"
by slaaaaaaaag November 29, 2007
From hiphop. A fat boy, oblivious of his lard and appearance, only likes pretty girls with extra large hooters, but as a failure with women, regularly resorts to breadfruit abuse for his carnal desire.
What a fatty , a kunumunu and a breadfruit abuser.
by CattlesRgr8 July 19, 2017
adj. a massive but nicely shaped ass.
noun a massive joint
Yo, shawdy got a fatty or yo let me hit that fatty.
by Ghetto Fab July 28, 2003
a blunt with high content of marijuana.

a girl with a round plumped ass, not to flat not to wide.
Damm, we are going to blaze a fattie.

Did you see her fattie?
by Catt February 13, 2005
"arr mate, I got gripped by the fatties with vandal grease on me silky's"
by John Gaskell February 12, 2004
To act, or actually be, stupid or dumb or ugly
Holy fuck, hannah is being such a fattie!
by gunnmeister October 31, 2021