Well to be honest, it doesn’t seem like a big deal. Half the other kids are saying embarrbuming **** like “daddy has a male reproductive organ and mommy has a woman's genitals and I have one too”, but you’re not hearing it because you’re not around them all the time. He will eventually learn not to say boobies everywhere he goes. If he’s only 2 I doubt you can reason with him and explain that it’s not polite to say boobies in public. But I dunno, try to get him interested in dinosaurs or trains and he’ll probably start pretending he’s a train and forget about saying body part names.