Stretchy 8
When a woman has had tons of sex vaginally and anally, her holes (which resemble the number 8, especially when texting an iLady) get stretched out considerably. A stretchy 8 is also achieved by the modern lesbian as her partner might be a bit too ambitious when picking out the size of their strap on.
"I slept with this girl last night and could hardly feel that I was even inside her!! Talk about a stretchy 8 - after several kids and apparently tons of sex, her shit was loose as a goose!! She needs a vaginal rejuvenation or to get going on some kegal exercises!! Damn!!