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1.
To comment in the middle of a conversation.
Michelle: So I went into Wal-Mart and there was a lady in her bikini buying her son a...

Hannah: If she had the audacity...

Michelle: Excuse me?

Hannah: Sorry I was just commentating.
by HannahJ9 August 13, 2012
 
2.
to go on a commenting spree
Bill: I was downtown the other day commenting on stuff for this documentary I'm making
Ted: Dude you were totally commentating!
by Justincredible! December 20, 2008