Everyone is entitled to use the word.
I use it freely and often...probably my favorite all around word.
If a bolt gets stuck..."ahhhh, this fucking guy is STUCK"
If someone cuts me off in traffic..."Thanks.....guy....in a rush?"
if someone owes me money...."When am I getting my money you guy?"
if someone does something funny...."Hahahhahaaa...that guy is funny as shit."
It has many uses...a truly utilitarian word