They're Like Humans, but Miniature. Teacup Humans.

Context

This line is spoken by Eric Northman, played by Alexander Skarsgård, in the TV show True Blood (2008-2014).

Eric Northman is the sexiest vampire south of the Mason-Dixon Line (#sorrynotsorry Team Bill). He's also over one thousand years old—old enough that he seems to have forgotten what children look like. When he meets Arlene's two kids in the episode called "Frenzy," he wisecracks to Pam that "They're like humans, but miniature. Teacup humans." Almost good enough to eat.

Where you've heard it

You say this when you're teasing your favorite niece or nephew.

This children's author was also probably a big True Blood fan.