Hilarity, in Internet-speak

• YouTube comment word
• Line subsequently encountered again in Australia? That's funny
• Goofy animal video response
• Response to a funny meme
• Kicks, on the Internet
• Amused Twitter term
• Online hilarity
• Interweb amusement, as it were

Wiktionary Word definitions in Wiktionary
interj. (context Internet slang leet English) Used to express laughter, often in a sarcastic fashion.