Taken from 'Rogers Profanisaurus'

A poetic term describing a lady's bodily treasure.

Presumably a very weird sex act. If it isn't, I'm sure that there all plenty of deviants prowling about there that will invent whatever the posh wellie is. I feel like it will have something to do with feet, seeing as a posh wellie is a nickname of sorts for Wellington Boots (I think) so it would make quite a bit of sense. It would also make sense for it to include rubbers, since Wellingtons are rubber boots. That's all I can think of, get to you glorious internet deviants.

A clever wooden device for removing your wellyboots without getting your hands dirty.

A woman who has a large and damp Vagina not too disimilar to that of a Yeti's Welly

the word oridgenated from when people stop working and start collecting welfare checks

the wednseday before the end of the month
you know welly day!

Tall,usually black,boots worn by women who are looking for one thing only.Normally sex. See Fuck me boots

Describing a big fat sloppy pussy. So called because when you fuck one of these mush buckets, it sounds just like a welly in soft mud.