I believe you may be using some fake slang terms for an egg-laden goldfish. There are a few websites, email chains and ill-researched magazine articles that have claimed a "pregnant" goldfish is called a twit, a twerp, or described as "ripe." None of these terms are ever actually used.
Not to mention that goldfish cannot get pregnant, because they are egg-layers. An egg-laden fish will be thicker in the midsection, but it's very difficult to tell unless you have experience breeding goldfish.