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1.
On the dot. I.e. at an exact time.
12 dotto dude, i'm claudette today
by lukeysl November 02, 2010
 
2.
Meaning 'on the dot' - refering to a chronological timeframe.
A - mate what time we doing lunch
B - Oh 12 noon dotto today, tough day
by llawrence August 20, 2008