I wouldn't have thought so, after my post I did some (I'll admit not as extensive) searches for other potential variations using phrases like "slang", "indian", "yamma", "yama" and even did permutations in within quotes to see if it would yield anything.

The only thing that was even mildly related to India is "Yama" but he's a hindu deity of death, nothing to do with genitalia.

Yammer is an english slang word for "to speak incessantly about nothing" which pretty much sums up twitter.