Everyone was falling off the pews with laughter when Pastor Dave slipped and said Milla was Charles's "new ride" instead of "new bride." It was so fularious, Grandma!
The superlative form of the word hilarious is formed by combining 'fucking' and 'hilarious' to create fularious. Fugly is a similar contraction that adds fucking to the front of an everyday term to add emphasis.
Barry: I'd pay money to watch Mike Tyson chili dog Jenna Jameson. That would be hilarious.
Lazy: Me too. Imagine him giving her a dirty sanchez afterwards all while he is wearing his boxing gloves. That would be fularious!
When a joke is told and you laugh way harder than you should, because that joke reminds you of something funny your friends have said that is now an inside joke. The joke is hilarious to you, but the literal meaning of the joke is only funny.