Oral stimulation in which the penis is fully inside the mouth either until orgasm or until proceeding to another sex act.
It’s not a blow job until somebody blows their wad…otherwise, it’s oral stimulation work.
And if it’s not done right the first time, then try, try again.
No, that would be bukkake.
Well, in that case it’s not just the hairdresser; it’s the hairdresser, the clerk, the janitor, the salon-owner and the girl’s cab-driver. 
You have to put some time and effort into it, a few minutes maybe, but orgasm isn’t absolutely required to fulfil the definition.
I actually gave this some thought. Then I remembered one of my ex-BFs, who would suck on my cock for a few seconds, because he knew that’s what I liked. I actually hated it, because what I really needed was an orgasm. Thinking back at him, I wouldn’t say that what he gave me were BJs.
Then I thought about my partner, who is so skilled that he can pleasure me for hours without an orgasm, yet I never have the feeling that I’m missing anything.
So my answer is: it depends.
Spit or swallow? I think that if a woman swallows my cum it constitutes a full “blown”
blow job. After all, my stuff belongs in a woman’s body, one way or the other.
And yes, I’ve swallowed a lot of stuff (whatever it is) that came out of a woman’s kootchie. (Not that I’m complaining!) 
Yeah, I thought about it. But you’d have to have blower (female) and blowee (straight male). Then, just in case there’s a difference, you’d need blower (gay male) and blowee (gay male)too. But then you might offend blower (bi male) and blowee (bi male), as they hate being left out. And you don’t want to forget about blower (bi female), and blow-me (lesbian female) either.
Feel free to start your own poll, but I just know I’ve left someone out
This is what I’d think, although I’d allow for “manually” to include other joint sexual activities, including intercourse.