phatty- adjective; pronounced "fatty"
1. Something big, large, noteworthy or extreme, sometimes unusually so
2. Something "cool", "awesome", "great"
ex: I went to a phatty house party last weekend...they had like 15 kegs!!
ex: Those are some phatty sunglasses...seriously, they're so big that I can't even see your face...
ex: That is the phattest guitar ever. Can I buy it from you?
The day after my buddy fooled around with my little sister, he couldn't wait to tell me the panties she was wearing could barely contain her wet phatty.