It means "no big deal." Unlike "nbd," "nobd" you can say outloud, and it is socially acceptable. It just sounds better than nbd. period.
"I just won the tennis match against Pedro...nobd."
"So, I just rode Top Thrill Dragster four times...nobd."
"So, I just rode Top Thrill Dragster four times...nobd."
by ynot1234 July 7, 2009
Get the nobdmug.