Possible Clues:

• "Hilarious!," in a text
• “Hahahaha” alternative
• “Hilarious!” to a texter
• "Oh, our sides are hurting!"
• "U r so funny!"
• "U r 2 funny!"
• “Quite funny,” on the internet
• [sooo funny!]
• Texter's "Hilarious!"
• 'Wow, that's 2 funny!'