A
lighter that doesn't do much but lazes around all
day.
It can be personified to refer to a
human being or animal or even a bird.
Bogdan: Hey Mech Adams, can you pass the lighter?
Mech Adams: Oh, that
one? That's a fatter.
Joe & McAdams: Sorry, what?
Mech Adams: It doesn't work; it burns neither calories nor cigarettes.
--
Joe: Hey, let's work on the assignment tomorrow.
Donald:
Sure, I'll find someone on Fiverr.
Joe: You
fucking fatter.