Websites to learn unofficial words and idioms in English? I don't mean vulgarism, but some words and expressions used by English-speaking countries as kind of 'slang', let's call it that way. For example... does expression 'to have jelly in sb's pants' exist? I can be not precise as I heard it some time ago and I couldn't find it anywhere. I suppose, it means sth like 'being excited about things around you and expressing it'... Anyone can help?