jab

Short definition from Wiktionary

Noun

1. 1
   A quick stab or blow; a poking or thrusting motion.
2. 2
   A short straight punch.
3. 3
   A medical hypodermic injection (vaccination or inoculation)
4. 4
   A vaccination, whether or not delivered via conventional injection.
5. 5
   A mild verbal insult.

Verb

1. 1
   To poke or thrust abruptly, or to make such a motion.
2. 2
   To deliver a quick punch.
3. 3
   To give someone an injection.
4. 4
   To vaccinate or inoculate someone.
5. 5
   To make fun of, to mock