Word changes.

The word 'guy' has come a long way in the transition of meanings over the years.
The first meaning, it was used in a way and created because of Guy Fawkes which was used as terror scare sort of meaning. Whereas now it is a noun which is to name someone like 'man' or 'woman. The word can also be as a verb to make fun of someone, 'she never stopped guying him for his weight.' The origin of the word came from low german routes.