When I asked my pregnant wife what she wanted for dinner, she replied…
“No thanks, I gestate.”
“Gestate” is an English verb meaning to form a baby inside, this is the action of pregnancy (after initial conception and before birth). It is an uncommonly used word but native English speakers of the early twenty-first century would know it.
“Just ate” is an English phrase meaning “consumed sustenance immediately before this moment.” It has the strong implication that the person is no longer hungry as they are presently satiated.
“Gestate” and “Just ate” sound extremely similar to one another, (the eh and uh are subtly distinguishable), allowing a pun to be made between the two.