badmashing

Combination of badmouthing and bashing, often used by a person that studders or has mush-mouth.

The sales rep was such an annoyance as he kept badmashing us in hopes it would make us look bad. In the end, it made him look like a total douchebag, and he lost!

billu badmash

It means to be a "bad ass babua" or "गन्दी गण्ड बबुआ"

He is such a "billu badmash".