What is a 'leafy comp' 'good/outstanding comp'?

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I see this term referred to on MN on lots of threads - what is the definition of such a school please? I can grasp the meaning (I think) but I'm not sure if it's metaphorical or there is in fact some objective criteria? Do posters mean they are Ofsted good/outstanding or something else? I've spent a lot of time living away and in my day a comp was the alternative to the grammar school but I'm not sure what they are when most areas don't have a grammar school these days? How will I know if my local schools fall into this leafy comps/good/outstanding category? Is it based on Ofsted or something else?

Apologies in advance if it really is just the Ofsted category they have been placed in rather than something more complex

From rabbitstew onwards I can see a new must-have lexicon appearing to rival the Good school guide, particularly for international parents trying to understand British education.

Roedean - what the Bishop said in the lifeboat.

Lancing - what you do to boils.

Christ's Hospital - where you go after Lancing.

King's - a school for chess players.

St Paul's wins. Hands down, no contest

...and probably recoiling in horror

Gordonstoun- a school for reeling. And writhing and fainting in coils.

Ampleforth : where the Monks have had plenty to eat

Oundle : for those who stubbed their toes on the old A1

Charterhouse : like a scheduled house but a bit cheaper

Radley : like a handbag but with less orphans

NLCS - Nice Ladies Can Sew.

Haileybury - a drama school for American actresses

Benenden any of the other chaps from the schools who were bussed in for the dance

Christ's Hospital - a school you only have to attend for three days

University College School - yes, all three, but not in that order...

Giggleswick School - laughter in class is very annoying.

Uppingham - a business school sponsored by the Pork Marketing Board.

What does that make Effingham High then, grovel

Oxford High - a school for weedy children

Effingham High - a school sponsored by Ann Summers

Marlborough College : for a smokin' hot education

The Perse - a school for children with money

Dulwich College - school for dim witches.

Sexeys School - because they are

LVA Ascot - make mine a double

Dragon School - say no more.

Bedales - a venerable school which allows alcohol.

Lockers Park - not short of storage space

Wrekin Park - pupils smash it up every term

I'm not sure if there is an upside to Downside.

Shiplake College - yes, but how on earth did it get there?

Bryanston school - school in a bit of a pickle over its spelling.

Caterham school - catering school sponsored by the Pork Marketing Board.