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Said in satisfaction after performing an impressive feat that requires skill in the game 'Spelunky'. May also be used in other games, such as Flappy Bird, or in real life.

Also an electronic music artist, best known for his track 'Sports' and the album 'Skill-dem-all'.
Player 1: (after skilfully throwing a rock at an airborne bat) Ah sick, did you see that skilldem?
Player 2: Aww, skilldem!
by Skulldem February 09, 2014