A rare facial expression pulled by those on the brink of falling in love, usually whilst they think no one else is watching. For example when working at a computer or watching TV.
Often accompanied by total inability to concentrate and the making of uncharacteristic mistakes - see gurple
Often accompanied by total inability to concentrate and the making of uncharacteristic mistakes - see gurple
No don't ask him, he went out with that girl again last night and now he's gurning like a hippo. He's not gonna get anything done today...
by Almosnoopy August 7, 2011
Get the Gurning like a hippomug.