Ninjavitis

A condition marked by frequently startling people on accident, such as while walking up behind or beside them to say, "Hello." Most accurately described as pervasive accidental sidling.

Ninjavitis most commonly occurs among those who wear wrestling shoes, women with small feet, and the Japanese.

Person 1: (Casually walks up beside Person 2) Hey, man!
Person 2: Dude, you scared the crap outta me! It's like you've got ninjavitis.

See also: sidler, sidle

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