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.
Short for "Ninja Invited" (see Also "Ninja Invite")
A term in on-line gaming, especially World of Warcraft. It's the process of inviting someone to join your group (party, raid or guild) without politely asking them first.
"Sorry, Honey, as soon as I logged on I got Ninjavited to the raid"
"We need someone to dps, just ninja-vite someone from LFG"
1. An oral condition that causes ones breath to be so noxious that it can sneak up on unsuspecting people and be nearly fatal.
2. When the physical state of ones mouth is so repugnant that it looks like a skilled ninja has drop-kicked them squarely in the mouth.
1. I heard that John is in the hospital, cuz he went to kiss Sheila goodnight, and her ninjavitis made him go into shock.
2. god rest his soul, but ODB musta been in a fight with the RZA cause even his goldfronts had sum ninjavitis