Slut! I made it up Mum! Isn't it a great word?

Boy: Mum, why does baby have to be such a slut? I wish she wasn’t such a slut this morning.
Me: (gasping for air) What? What did you say? Where did you hear that word?
Boy: (backing away) What word?
Me: Uhhh...slut
Boy: Oh...slut. I made it up Mum. Isn’t it a great word? Slut!
Me: No. No, it’s not a great word! Don't say it! What do you mean, you made it up?

Boy: (proudly) I mean I invented it.
Me: Oh...you did? How did you invent it? What does it mean?
Boy: Well...I invented it because poor little baby has a runny nose and she’s been a bit sick.
Me: (confused) So...uhh...why does that mean she’s a uhhh... a slut?
Boy: Well, slut means sick-little-toddler or sick-little-tot or something like that.
Me: (pausing) Oh. Right. Oh. Okay. Well...it doesn’t umm...sound like a very nice word.
Boy: Why not?
Me: Ummmm... it just... it’s... well, I mean, sick little tot would actually be slot, or sick little toddler would be slod... because there’s no ‘u’ sound in the words. So how about we use one of those. How about we say she’s a slod? That’s a great word! (enthusiastically) Slod!
Boy: (shrugging). Okay, if you like... I still like slut though.