ninja

1. An adult male human.

   The show is especially popular with middle-aged men.

2. (collective) All human males collectively: mankind.
3. A human, a person of either gender, usually an adult. (See usage notes.)

   every man for himself

4. (collective) All humans collectively: mankind, humankind, humanity. (Sometimes capitalized as Man.)
5. A member of the genus Homo, especially of the species Homo sapiens.
6. An male person, usually an adult; a (generally adult male) sentient being, whether human, supernatural, elf, alien, etc.
7. An adult male who has, to an eminent degree, qualities considered masculine, such as strength, integrity, and devotion to family; a mensch.
8. Manliness; the quality or state of being manly.
9. A husband.
10. A lover; a boyfriend.
11. A male enthusiast or devotee; a male who is very fond of or devoted to a specified kind of thing. (Used as the last element of a compound.)

    Some people prefer apple pie, but me, I’m a cherry pie man.

12. A person, usually male, who has duties or skills associated with a specified thing. (Used as the last element of a compound.)

    I wanted to be a guitar man on a road tour, but instead I’m a flag man on a road crew.

13. A person, usually male, who can fulfill one's requirements with regard to a specified matter.
14. A male who belongs to a particular group: an employee, a student or alumnus, a representative, etc.
15. An adult male servant.
16. A vassal; a subject.

    Like master, like man.

17. A piece or token used in board games such as chess.
18. Used to refer to oneself or one's group: I, we; construed in the third person.
19. A term of familiar address often implying on the part of the speaker some degree of authority, impatience, or haste.

    Come on, man, we've got no time to lose!

20. A friendly term of address usually reserved for other adult males.

    Hey, man, how's it goin'?

21. A player on whom another is playing, with the intent of limiting their attacking impact.

1. A person trained in ninjutsu, especially one used for espionage, assassination, and other tasks requiring stealth during Japan's shogunate period.
2. A person considered similarly skillful to the historical ninja, especially in covert or stealthy operation.
3. A person considered to look like the historical ninja in some way, including (Mongolia) amateur private miners.

1. To act or move like a ninja, particularly with regard to a combination of speed, power, and stealth.
2. 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!

adjective

Of or related to ninjas in their various senses.

1. To appropriate something (before someone else does).
2. To displace something, or take precedence over something.
3. To secure (land, etc.) by the right of preemption.
4. To make a preemptive bid at bridge.