Deimos is one of the main fighters in Madness Combat, the long-running animated action series created by Krinkels and first shared on Newgrounds. Alongside Sanford, he became a fan favourite for his trench coat, sunglasses and relentless gunplay, and short clips of the duo are widely reused in fan edits and memes. The yippie kayay line plays on the classic action-movie catchphrase, which fits Deimos perfectly: a cheerful shout dropped into a brutal fight. That mix of humour and combat energy keeps the clip useful for creators long after the original episodes.