A doll?Bricks! Seems to be an abbreviated "Bikkuri shita" ("I was shocked/surprised/sh@t bricks"), so I went for the only equivalent clipped expression I know.What's she use this for?What, indeed.
The katakana here for the word "what" infers "masturbation" as well from the word オナニーGet on up-pah!Gotcha.Don't say that to her face.Auntie Balls!Who're you going to wake up next?Good morning! It's morning!Wa ha ha!SkfffrrssshhWhy are you taking her clothes off—SnappFwapf