Who was Robin Sparkles singing about with those angry, obsessive lyrics?

You hear this? This is the sound of me moving on. WHOO! Yeah, i’m a stripper.
♫ Barney is the new leader of the gang and life just got way more awesome! ♫
“Oh, and check it out, we worked out a theme song for Puzzles.”
“While I was carrying 100 pound kegs up four flights of stairs? Awesome.”
-How I Met Your Mother 7x13 “Tailgate”