Is this a generation thing ?

Probably generational, I'm pretty sure its something my Dad would of said but not something I would so its not been passed down in my family to children and grandchildren they wouldn't have a clue.

I don't have a clue either Nina unless....put a log on the fire?

I do not have the foggiest what it means either- I would also think about wood fires.

It means 'close the door'.

I'm from Lancashire and I know it, my great aunt used to say, "put wood in th'ole". (Close the door).
I don't use it, haven't heard it for years.
Peter Kay uses these old phrases like, "put big light on" in his comedy routine.

My mum and nan used to say this - LOUDLY!

I'm a southerner and I know the expression, and have even been known to use it myself!

I'm a southerner and know it though seldom use it.

Strangely it's not something I've said for years. I don't know what made me come out with it
My children knew what it meant.

I frequently use this expression to DH with reference to cupboard doors which he usually leaves open. Have to say it has no effect whatsoever. We're from adjacent towns in Staffordshire so he does know what it means.

When I was growing up the phrase was usually accompanied by the question "were you born in a barn"

Generational I would think, along with born in a barn.

Great minds sunseeker ?

Yep, born in a barn here. Never heard of wood in the hole.
Must admit, I initially assumed it was related to sex.

I would say generational ....I do say it ..." it's a bit parky in 'ere,put the wood in the 'ole"

My parents used to say it, along with, "put your leg in bed" for linking arms!

'Put the wood in the hole' was one of my Dad's favourites along with 'no sae green as ye're cabbage looking'. And he was born and bred in Fife.

Definitely a generational thing, I remember it as well as green as cabbage looking.
One saying I remember but not many others do is 'once in a Sheffield flood' meaning not often. I don't know the origin of this apart from the obvious.

I'd never heard the saying 'piffy on a rock bun' or 'put t'wood in t'hole' until I met my MIL, although she wasn't from Yorkshire.

I am from Yorkshire and have never heard of the wood in the hole or piffy on a rock bun (eh?) although all adults used to say 'eee' a lot.

I say "piffy on a rock bun" and I was brought up in North Cheshire.