Slangs are the expressions which are used in their most informal usages.Slang is language at its most informal, using expressions that many would consider to be grammatically imperfect and sometimes rude. Slang often used within small social groups where it can help draw and keep the group together. It changes very quickly in English.
Cockney Rhyming Slangs are the specialised forms of slangs used in the East of London. This kind of Slang is a kind of antilanguage where words are replaced by phrases that rhyme (sound the same): North and south = mouth Adam and Eve = believe Sometimes, the last word is dropped.
Slangs beginning with Y :
Yinz : (USA) Yinz is a plural form of 'you'.
Yob : (UK) A yob is a hooligan, an anti-social young person.
You can't polish a turd : You can't make something better than its maximum potential
You got hands like feet : If someone has hands like feet, it means they can't catch things.
You snooze, you lose : If you don't act, you will miss an opportunity
Your ass is grass : This means that you're in big trouble.