Weather vaning is when a ship/boat/wings of a windmill/aircraft is allowed to spin in the direction of wind freely. Its basically allowed so that no damage/breakage to the equipement/machinery happens due to the force of the moving wind.
Janitor: Do you like vanning?
Molly Clock: I don't know what that is.
Janitor: Sort of like taking a long drive in a car... except in a van.
Molly Clock: ...still not getting it
A member of a social network group or forum that continuously posts incredibly shitty music, while commenting to themselves alone. Threads reaching upwards from 5 to 65 comments per post from op to bottom.
The act of dancing while one sobs and cries profusely, usually while one's life is in great danger, yet still totally rocking it.
Person X is being threatened and forced to vance by a chainsaw-wielding monster. Person X starts vancing, absolutelygoing to town while crying their eyes out in the fear of death.