Might wanna check who he's been around?

Maybe you can try asking him where he learned that, or maybe check who he's been around with these past few weeks or days. Or maybe he just saw it on TV.

And this, my friends, is how incest starts.

Watching too much Drake and Josh

Boob is not a bad word for a toddler to know, my 3 year old says it all the time because she sees me feeding her brother, says I'm feeding him boobie

You say that as if "boob" is a swear word. I get that some people have different ideas of what is or isn't appropriate language, and I can admit that a kid saying that in certain contexts might be a little awkward, but come on...Is it really the worst thing he could be saying?

Sounds innocent, the toddler won't understand context and is probably just trying to understand their world. a friend of mine works at a day care and had a 3 year old try to kiss hers and then said "titties are for kissing" That's when you could be worried. . .

He's toddler so he probably just thought it was a funny thing to do. I'd honestly focus more on telling him why it's not right to kiss your sibling's chest than the fact he said "boob" though.

It's America. Where didn't he learn that word?

Why not ask the one with the boobs? Your daughter? As a daughter, I complain about my boobs a ton. Probably the source?