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 I :
I get paid and we all get laid : (USA) It's an expression of thankfulness because it's the weekend...most people get paid on Friday. "It's finally Friday. I'm really looking forward to the weekend. I get paid and we all get laid!"
Ice : If someone is iced, they are killed, though this is more used on TV shows than by criminals.
Ice : Ice is a name for crystal form of the drug methamphetamine.
Icy : (UK) something that's icy is extremely good or cool.
Ignoramus : (USA) An ignoramus is both ignorant and an asshole.
In the house : (USA) If someone is in the house, they are present, at that place.
Innit : (UK) 'Innit' can be used an an all-purpose question tag, or as a way of agreeing with what someone has said.