In you best head-tilted-to-one-side-as-you-squint-through-your-glass-eye tone of mild investigative befuddlement:
"So ... you're saying that this -- what was it? -- this 'butt douche', if I have it right ... you're saying that this is actually ... now, help me out here; I'm just trying to get the whole story ... that it's actually what they would call an 'enema'? That's fascinating, Mr. Trask; simply fascinating. But, if you'll forgive me, I just have ... well, it's just, there's one more thing, here, that I just can't figure out about this butt ... this, ah, let me just look at my notes, here ... this, ah 'enema', as you say ..."