The 'S.I.M.P. (Squirrels In My Pants)' meme originates from a high-energy rap song in the Phineas and Ferb episode 'Comet Kermillian,' which aired in 2008. In the scene, a group of street performers sings about squirrels literally being inside Candace Flynn's pants, causing her to dance erratically. While the term 'simp' has since evolved into internet slang for someone being overly submissive in a relationship, the meme serves as a nostalgic counter-culture reference. It is frequently used to subvert modern slang expectations or to celebrate the chaotic, catchy nature of late 2000s Disney Channel animation.