It means the intestines are perforated. The joke is that the stress caused her to have an ulcer, who then turned into a perforation. Medically, I think it's relatively safe to say it's a bad situation, since intestine juices (almost crap at that point) will leak in the body and rot.
This is everything I hoped it would be, the only thing missing is AL Zuikaku and KC Akagi trying to defuse things
Bitch.Shoukaku(KanColle) is having a gastrointestinal perforation.So you're Kaga-san from Commander's "previous" workplace, correct? It is an honor to meet you❤Kaga(KanColle) & Shoukaku(Azur Lane)Azur Lane's Shoukaku.KanColle's Kaga.Whoaa...Now I'm mad.Me too❤What are you blabbing about, Shoukaku—!... I suppose insolence is CarDiv 5's selling point.Oh dear. This is why "Senpai—You grilled chicken restaurant."Admiral" still has work to do here. Besides, it is not possible for me to hand over the battle to an insolent bunch like you. Know your place.The power of us, CarDiv 5, alone is more than enough, so it's fine for you to disappear from here. It's alright if you step down and press your responsibility to us, like "before". Thank you for your hard work~Shut your mouth, CarDiv 5. Just who do you think has taught you about fighting. Besides, you act like a victim—
Are you being sarcastic—