Person 1: I gotta say,
Emma's pretty
hot, I think I'll go for it
Person 2: Are you joking?? She's as flat as the Great Plains!
Alternatively, with the acronym in place...
Person 1: I gotta say,
Emma's pretty hot, I think I'll go for it
Person 2: Are you kidding me? She is, and will forever, be F.L.A.T
(The first instance is much more commonly used)