The Norwegian forward came on as a substitute replacing Jack Grealish just after the hour mark and found the back of the net in the 71st minute from Kevin De Buyne's assist, thereby sealing a crucial 2-0 win for his side against Nottingham Forest.
After scoring the all-important goal, Haaland approached one of the microphones kept near the sideline and appeared to copy Homer Simpson's catchphrase - where the animated character says 'Woo-hoo' - from the famous American sitcom The Simpsons.