The longest word in the English language, according to the Oxford English Dictionary, is 'pneumonoultramicroscopicsilicovolcanoconiosis'. It doesn't mean anything - it was invented in 1935, purely so it could be the longest word in the English language.
I think this is the longest word in the English language that actually means something? Floccinaucinihilipilification - to estimate something as worthless.
I've always liked Antidisestablishmentarianism However, it is difficult to bring it into most everyday conversations.
Woooooooooooooooooooooah. Flashback or what - bored, picking the glue between the tiles on the assembly room floor, knowing the imminent bollocking for putting a hole in school trousers again. Still, that was last week...