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Navvy Gravvy 

Unlike Itsy Bitsy and Teeny Weeny, Navvy Gravvy doesn't refer to just a small size but to a small amount. A navvy gravy is a very small amount, a little tiny bit, a very fine shaving. In common use within the Royal Dockyards where very small adjustments have to be made, by shipwrights and shipfitters, to customise components in order to get them to fit correctly. Thought to date from around the mid-nineteenth century when many tasks in shipbuilding were still carried out by 'eye', although the origins or the words themselves are not entirely clear, it is still in use today where non-standard sized items have to be adjusted to fit.
As an illustration; if a hole is drilled in a piece of metal to take a bolt, the hole is the correct size but the bolt doesn't fit. The drill is then run through the hole again and the bolt fits. Careful examination may reveal a few grains of metal dust or the tiniest finest curl of swarf removed by the drill, that tiny amount is a navvy gravvy.
"If we just take a navvy gravvy off that leading edge, it'll fit perfect."
Navvy Gravvy by AKACroatalin April 19, 2015
Related Words
I’m a beautiful queen all hail me
All hail NAvvYa
navvya by I did ur mom November 1, 2020
I’m a queen all hail me
NAvvYa must be praised
navvya by I did ur mom November 1, 2020

Nevvy Nap 

A person who sleeps more times during the day then a 90 year old woman in a care home. Also known as Neville aka ‘The Longest Bottom
OMG, is he having a nevvy nap, again? That’s twice this afternoon.
Nevvy Nap by K1NG L3ONIDAS October 14, 2021
All hail Navvya the queen
Navvya by I did ur mom November 16, 2020

Navvy savvy 

Someone who is good at finding their way around (navvy - navigation; savvy - knowledge, ability)
That guy's really navvy savvy.
Navvy savvy by Sarah Downing April 5, 2006