A precise or exact time or quantitative volume, such as money or weight.
Expression of satisfaction when a plan or event is successful.
A synonym for "excellent" or "grand stuff"
Eg 1) At the airport when checking in your luggage, your baggage comes to the exact limit allowed.
You yell in delight at the person checking in the baggage : "On the nose!!"
Eg 2) Your favourite sports team scores a cracking goal; you scream "On the nose!".
Eg 3) "I get into work every morning at 9 o'clock on the nose"
Eg 4) "See you at the part tonight then?" "On the nose!"