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Chuck-ya (or Chuckya) are minor characters in the SMG4 series.
They are big purple Bob Bobowski-ombs that appear in the video game Super Mario 64 on the Nintendo 64. SuperMarioGlitchy4's videos being especially based on that same game, some Chuck-ya appear in a few of them.
One also appears in SM64 Christmas 2014: The Bowser That Stole Christmas.
They make minor appearances in a few other videos.