An inexplicable, noticeable, callous on any little toe on one's foot which can only seem to be explained by one doing ninja like acts.
You sit and rest one foot on the table. Roommate notices an ugly yellow scab looking thing on the middle toe of your foot.
(Roommate): "Dude! How did you get that callous!?"
(You): "Wtf!? I don't know! It seems like some kind of ninja callous!"
Knowing that you weren't up to any ninja-like activities, you decide to pick at it, then realize its a piece of dead leaf.
When you nut inside without asking or without giving warning. Typically followed by by continued fornication out of embarrassment for busting so early and in hopes the ninja cream won’t be noticed.
She was absolutely doing tricks on it, so I had to give her a ninja creamy
ginger ninja a person who tries to throw water at little kids
To quit a job without anyone knowing. Be stealthy like a ninja. Just slowing pack up your stuff little by little and then never come back.
I hated that job so much that I had to ninja quit. Slowly packed up my shit and left my resignation letter in boss' letter tray.
The art of mysteriously and secretively tweeting multiple times whilst being fully engaged in a two-way conversation.
Bob: Bro, we've literally been talking this entire time and you don't even have your phone near you. How did you manage to tweet 15 times in the last 3 minutes?!
Mox: Two words my friend: Ninja-Tweeting.
a HotBox Ninja is someone who has to sneak in the bathroom and smoke weed because they are an in the closet pothead.
Ducky: Why were you up so late?
Nova: I was being a HotBox Ninja in the bathroom last night.
What Tactical Tommy calls his clothing optional scented oil-covered all male rainbow unicorn parties in magical Saratoga.
Oh my. Tommy is doing ninja stuff on the lawn again. Get the hose.