2 year old calling me 'papa' instead of 'mama'. Is that common?

Maybe his sinus is blocked so he might have been saying mama but it sounds like papa. If that is not the case then maybe try see if he can pronounce other words with the letter M. See if he actually can pronounce the letter M properly. If he can then maybe he just really wants to call you papa.

If you notice that he can't actually pronounce the letter M, it is time to get him checked and you might need a speech therapist.

That's sounds a little concerning. I'm a nanny and the little boy I used to watch had the same habit and also had delayed speech but we discovered that he learning/intellectual disabilities and with it came the fact he had a difficulty understanding that different people had different names. He called me, his, his dad and everyone else

daddy. But that's just his situation of course.

Very common I do it all the time when I am having super kinky butt sex somthimes i forget the safeword and she hurts me and i can't sit down 4 a week

I'll get you in bed and call you mama >:D

He probably thinks you guys are gay dudes. Do in look like a guy by any chance?

It sometimes happens so. No worry he will correct it soon.

Why does it matter - you feel left out?

Haha, maby you look like one! LOL *****