My son actually said "man boobies"

   Yes, yes you read that correctly...my four year old son said "man boobies" today.  His obsession with all things boobie continues.  He was sitting in my lap, snuggling.  Nothing unusual there.  Then, as his new obsession continues, he complimented my boobies.
Colin "Mommy, I like your boobies(he says as he pats them)"
Me "Well, thanks bud. But remember, you can hug mommy, and use them as pillows, but touching them in public is just a little odd.  And grabbing them is just rude..."
Colin "OK Mommy, your boobies are squishy."
Me "Yes they are little dude.  Now, lets talk about something else."
Colin "alright Mommy, what are these?? (lifts his shirt, points to his belly)"
Me "that's your tummy..."
Colin "no mommy, what are these? (points a little higher, but still on his tummy)"
Me  "that is just your belly little man, why?"
Colin "nope, those are my man boobies..."
   I just shake my head...what do you say to that?  And where did he learn that term?  I suppose there are much worse things he could call them, but seriously, man boobies??  I suppose he at least used it correctly...I mean, if they are going to curse or say something bad, it should at least be conjugated correctly and used in the appropriate context.