fanny bagging
Placing a bag (normally a handbag) behind your knees and in front of your crotch when sitting down to prevent people looking up your skirt and seeing your knickers
It was nice outside today but all the girls were fanny bagging
fanny like a bag of old mussels
A large, clunky, old vagina which gives off a strong smell of rotting sea-food.
He had visited a cheap prositute the previous evening - too much make-up, drooling smile, tits at waist level and a fanny like a bag of old mussels.