Ninjas

An adult male human.

"The show is especially popular with middle-aged men."

(collective) All human males collectively: mankind.

A human, a person of either gender, usually an adult. (See usage notes.)

"every man for himself"

(collective) All humans collectively: mankind, humankind, humanity. (Sometimes capitalized as Man.)

A person trained in ninjutsu, especially one used for espionage, assassination, and other tasks requiring stealth during Japan's shogunate period.

A person considered similarly skillful to the historical ninja, especially in covert or stealthy operation.

A person considered to look like the historical ninja in some way, including (Mongolia) amateur private miners.

To act or move like a ninja, particularly with regard to a combination of speed, power, and stealth.

To claim an item through abuse of game mechanics.

"That damn warrior ninja'd an epic-quality wand even though he can't even use it!"

To appropriate something (before someone else does).

To displace something, or take precedence over something.

To secure (land, etc.) by the right of preemption.

To make a preemptive bid at bridge.