Possible Clues:

• Celebratory initialism
• Approving online initialism
• "Success!," in textspeak
• Celebratory online acronym
• Texter's "Success!"
• Internet initialism indicating excitement
• 'Victory!,' in internet shorthand
• "Woo-hoo!," in textspeak
• Internet exclamation hidden in 'software'
• Celebratory acronym