Related Clues:

• Guffaw in an AOL chat room
• "I'm hysterical!" in netspeak
• 'That's too funny,' to surfers
• Texter's guffaw
• 'That's hilarious,' in Internet-speak
• "That's hilarious," in Internet-speak
• It's somewhat stronger than LOL
• ROFL alternative
• 'OMG that is funny'
• Texter's expression spelled out by the starts of 18-, 28-, 46- and 59-Across
• "u r 2 funny!"
• 'OMG 2 FUNNi!'
• 'ZOMG! That's too friggin' hilarious'
• 'U so funny'
• 'OMG, I'm cracking up!'