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In this context: an action oft-considered unusual, embarrassing, frowned upon, dangerous or difficult, performed with relative ease and more importantly with a relaxed, indifferent air.

Often misused for actions that are completely normal and of no interest to others e.g. "Casually watching a particular DVD".
Casually sharing my sandwich with a lion today.
Casually strolling through the street in my pyjamas carrying nothing but toilet roll this morning.
by maxek May 27, 2013
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To complete a task with ease, without trying
"Casually winning the fifa tourney on goal difference; beating downs 4-1 in the last game to be joint on points with him with a 4 goal difference"
by wopperburger December 30, 2011
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