Definitions from Wiktionary (tweak)

▸ verb:  (transitive) To pinch and pull with a sudden jerk and twist; to twitch.
▸ verb:  (transitive, informal) To adjust slightly; to fine-tune.
▸ verb:  (transitive) To tease, to annoy; to get under the skin of (someone, typically so as to irritate them, or by extension to enamor, frighten, etc).
▸ verb:  (intransitive, US, slang) To abuse methamphetamines, especially crystal meth.
▸ verb:  (intransitive, US, slang) To exhibit extreme nervousness, evasiveness when confronted by authorities, compulsiveness, erratic motion, excitability, etc, due to or mimicking the symptoms of methamphetamine abuse.
▸ verb:  (intransitive, slang, by extension) To be extremely confused; to have no clue what is happening.
▸ verb:  (military, weaponry, uncommon) From a catapult, to strike a target with a missile.
▸ noun:  A sharp pinch or jerk; a twist or twitch.
▸ noun:  A slight adjustment or modification.
▸ noun:  Trouble; distress; tweag.
▸ noun:  (obsolete, slang) A prostitute.
▸ noun:  (slang) Methamphetamine.
▸ noun:  (slang) A single inhalation of cocaine.
▸ noun:  (cryptography) An additional input to a block cipher, used in conjunction with the key to select the permutation computed by the cipher.
▸ Also see tweak

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