To Dark-Horse (verb)
To act in a sly or secretive manner, rarely letting others know what you're doing, where you're going, or who you're going with.
Being a very shady character, and being quite quiet are essential to perfecting this action.
A good poker-face is obligatory, of course.
I saw Ryan buy 4 different cards for Valentines Day, he is such a Dark-Horse, i never know what he's up to.
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