"Louis ck'ed" or rather just "ck'ed" is the act of masterbation in the audience of one or more people without having any or full consent to perform said act.

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Surreptitiously standing behind someone and pretending to jerk off with the intent to startle, gross out, or annoy them. The Louis CKer should perform this act either by whispering nonsense things in a seductive tone (think David Banner’s “The Whisper Song”) or by making as much noise as possible to indicate you are jerking off (nylon pants or a windbreaker would be excellent for this).