this was not given directly, but inferred from the entry for "pork". This follows the pattern of tera' X where X is a Klingon creature that is similar to a Terran creature. Due to the inconsistent overlap between these creatures, multiple Klingon creatures can be used to talk about the same Terran creature.

In KGT the Suy' is introduced and it said to resemble a Terran pig, so the point where Suy' is used as in insult that means the same as calling someone a "pig".