A girl with a vagina so badly damaged when she upens her legs it looks like a hippo with its mouth open.
Dude I was going down on her and took her panties off and I got scard I thought I was on the Discovery channel, She had a cunt like a Hippo yawning and it made a wierd noise at me.
An expression commenly used for people who do things secretly or are very skilled at something. It really has nothing to do with hippos, just the fact that hippos are very craft and trixy.
Viviana walks up behind Linnea while she's talking to Veronika and Kaylee
Viviana: Hello Liddea!
Linnea: Ahhhhh!! You scared me vivi, you crafty hippo!