Looks like a big huge booger

Looks like a green or yellow tinge chunk of snot, its gross. Think of blowing your nose during a head cold. And size will range from tip of thumb to several inches

look on google.. seeing a picture is the best way to describe it.. lol its gross but it's a natural thing...

Yellow/creamy colour, like a big blob of discharge. You can loose your plug weeks before labour, because he can repair itself and keep coming away.