phat
A more insulting way of saying "fat," because it seems to have originally been a lie that you weren't fat, but only cool (phat). Being called fat in deceit is far worse than just being called plain fat.
"You're fat," Jeff said.

"What?" Erica asked.

"Uh, you're phat," Jeff said. "You heard of 'phat,' right? With a 'ph?'

"Litmus testing?" Erica asked.

"It means cool," Jeff said.

"Fuck you," Erica said.