Mechanic

[Sarah]

A person who fixes things, esp. cars, planes and bicycles.
A cliched term for an assassin in movies that has no equivalent in the real world.

[Zipporah Schumaker]

The first person that you want [as a friend], [the last] person that you want as an [enemy].

[Justin Bieber]

A skilled worker who repairs and maintains vehicle engines and other machinery.

[Marquetta]

Someone who does [precision] guesswork based on [unreliable] data from those of [questionable] knowledge.

[Jason Yan]

A card-dealer at high-stakes poker who is [adroit] at [manipulating] the cards in [the deck] to favor one player over another.

[Sonia]

A [mechanic] is a person that has sex with transsexuals. A mechanic is known to [work on] [trannys].

[Agnes]

Once aided in saving the universe by informing Captain that somebody had set up us the bomb, thus causing [Captin] to [launch], or take off, every [zig].