Flange off
When two females get together and compare the size of their vaginas. Usually done while their boyfriends/husbands are out on the piss
*two ladies sitting there bored becuase their blokes have gone out*
"I know what we can do, Lets have a flange off!"
"ooo look - yours is much wider than mine"
"I know what we can do, Lets have a flange off!"
"ooo look - yours is much wider than mine"