He was a good guy, and a great employee. But then I caught him in bed with my pikachu, so I had to have him offed.
To "off" a
person means to
kill them. It is a
slang term and
implies that they were killed in a
routinized gangster (not
gangsta) fashion, rather than in
self-defense or in a
fit of passion. It is
insultingly
casual, and should never be used in a
formal situation, or when you want to convey the least scrap of
sensitivity.
Off is also the name of a popular brand of insect repellent, more properly rendered "
Off!".