It's a play on her name. The translation should probably be "Iku... Iku! Need to IKUU!!"
Musashi: Those fucking PT nuisances ruined my mood for fighting Battleship Water Oni!! Their mocking laughter really gets on my nerves! Next time I'll definitely blow them up with my 46 main cannon! Tokitsukaze: It leaked again...what do I do...The truth only Aoba knows!!Yuudachi: I'll start by getting medium damaged and pretend to surrender...then, when the enemies are caught off guard, I'll rush in and have an amazing party that reproduces the nightmare of Solomon poi!Aoba's Behind the Curtains of the Resource Operation revealed...!!Hyper Kitakami: Resource operation, huh...How troublesome...I'll just hit some low health destroyers and return I suppose...Kaga: Akagi ran away again...I don't feel like fighting...I just bomb some small fries and leave the rest to the battleships...Ooi: My torpedoes will always follow Kitakami. 19: Iku! Is turning 19!!
(I think this is what the author was trying to say, since "19ing" doesn't seem to make as much sense)
It's more likely the "ikuu" (cumming) meaning in Japanese.