The phrase "gear up" typically means to get ready for something, to be prepared. It is normally used informally to describe the start of the preparation process.
To 'coin a phrase' means to have invented it or 'came up with it'.
It means that more gear oil is put into the gear box in order to have it at the right level.
Its how u shift up and down thru the gears... eg. + = up a gear - = down a gear
If I am not mistaken that means you need to shift up a gear
Roll a joint
The Phrase "It is as handy as it is becoming" means it is as useful as it is up and coming.
The phrase button it up means to complete it or finish it.
I think you mean the shifting pattern? 1st gear- far left and up 2nd gear- far left and down 3rd gear- middle and up 4th gear- middle and down 5th gear- far right and up reverse gear- far right and down.
This means that a person a has enough.
Becoming more mature
The phrase "knocked up" is slang for pregnant.
Most motorcycles have 1 gear down, and 5 gears up. You push down for first gear, and lift up on the shifter for the other 5.