Plus "Baby It's Cold Outside" is super rapey. It's not even a PC sort of thing. Even if your conservative, it plays like a very special episode of an 80's sitcom. How it ever got counted among things like Jingle Bells and Silent Night is beyond me.
It's really not, its just playful banter.
Literally, "Say what's in this drink? (No cabs to be had out there)"
She wasn't asking if he roofied her drink.
The fact that I didn't have explain to you why that sounded bad pretty much demonstrates how, regardless of it if was meant as cute or not, the lyrics come off as creepy.
70 years ago, nobody thought it meant that he spiked her drink because the original date rape drug did not yet exist. My how times change! ---