"Plucking" part of your body means pulling hairs out of it, one by one, usually with tweezers. You can use the word "pluck" to talk about either the object, or the hair itself:
Do you pluck your eybrows?
I saw a gray hair, so I plucked it.
Sometimes people say "pluck out" to talk about the individual hairs (but not the whole object):
I saw a gray hair, so I plucked it out.
Aside from body hair, things that people "pluck" include:
- a chicken
- fruit (from a tree or bush)
- the strings of an instrument