An expression of celebration after an absolutely sick play in a video game, sport, or just a generally sick moment in real life. The term is said enthusiastically, and should always be before an exclamation mark. It is very effective when said after a sick 100m snipe as well.
Fonz: APOINGUS! HA! You suck man, go look at some stretch marks doofus!

Bavid: Cmon man, you know I can't beat someone as legendary as you. By the way, you and toucan's ex would make a great couple.
by TheLegendaryFonz September 7, 2021
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