A lot of these other definitions are wrong, so here's the actual
definition.
(v.) The process by which
the sex of a sexually dimorphic
animal is determined. This is commonly done biologists and agricultural workers.
Bob: Are you done sexing those animals like I told you to?
Jeff: Yep! It was a
bit difficult getting my dick inside that
duck, but-
Bob: WHAT THE ACTUAL FU- Sexing means to determine whether the animal is male or female! Are you
even a real scientist?!
Jeff (thinking): Ack! He's on to me!
(Jeff then runs away)