a simile for a particularly large
vagina, named so because it resembles a hippo yawning. minus the big teeth a hippo possesses of course. that would just be
weird.
a hippo's yawn can usually be found attached to a slosher or perhaps a lady that has given birth to twins with heads
like south park's mr mackey.
trevor : how'd it go with that
slag last night then?
pete : mate, she had a minge
like a hippo's yawn
trevor : that bad huh?
pete : seriously, it was
like stirring a bucket of wallpaper paste with a pencil