Terminology

The first Terminology, is Locution. This is the literal sense, for example if a child asks his mum to go out to play, and the mother replies 'its raining'. This is the locution as its a justification by the mother on why the child cant go out to play. 

The Illocution is the implied meaning, going back to the last example, the illocution is what the child implies from the mothers comment. In this instant it will be 'no', as this is what the child takes from the question, of can they go outside.   

The Perlocution is the perceived meaning, in other words its the overall message. Going back to the example in the last two paragraphs, the perlocution will be 'your not going anywhere', this is what both ,the child and the mother imply from the question.   

The Cultural Assumption is a joke based on where you live, this could also be seen as comedy or a sarcastic comment that people only based in the country (city) can understand. 

For example this Cultural Assumption picture, is a mockery towards the airport Heathrow. This picture is labeling Heathrow as a zoo, due to how busy Heathrow gets. Only people that use Heathrow frequently will understand this joke. Overall the picture is stating the people should choose Luton airport because its got private terminals, instead of going to a busy Heathrow.