The word "busung" is correctly only used for animals that are pregnant, when it is used to refer to a pregnant person, it is very crude, insulting usage. 
 
However, the word can also mean bloating or swelling, and when this sense is intended, it can be used to refer to a person. 
 
"Meteng", on the other hand is ngoko and is correctly used in this Javanese language level to refer to a pregnant person.  
 
There are other words to refer to a pregnant person, both in Javanese & in BI.
		 
		
		
		
		
		
		
		
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