Slippery Flipper 

Verb
To insert any part of one's foot into a woman's vagina.

Noun
A sexual act whereby one partner inserts any part of the foot into a woman's vagina.

A description of a woman's vagina while there is any part of a foot inside it.

"I hope you washed your foot before you gave her a that slippery flipper."

"Does she love you enough to be your slippery flipper?"

"I slipppery flippered her all night."

"They got kinky in bed and he put on the slippery flipper."

"He jammed his foot in her vagina, wearing it like a slippery flipper."

Slippery Flipper by hulk smashed January 23, 2013

flipper-slipper 

When your tube sock(s) hang off the end off your foot 1/2 way and they fop around.

When children's sock(s) slide/fall down.

NOT to the point of falling off though, just 1/2 way.

'When I got out of bed this morning my socks were flipper-slippers!'

'That baby's got on a flipper-slipper.'

'Flipper-slippers are fun to slide on the kitchen floor in!'

flipper-slipper by Patsea Chema October 1, 2011