The porn video tag "faggot-joi" contains two parts. First, the term "faggot" refers to a male, particularly in the context of gay or bisexual sexual activity. This is often used as a way to describe a man who enjoys receiving oral sex from another man.
The second part, "joi," is an abbreviation for Japanese eromanga artist Mamoru Oshii's pseudonym "JOI." He often draws scenes of female characters indulging in pleasure or orgasmic bliss. The term "Joi" itself has been adopted by the English-speaking adult industry to represent a particular kind of content where women are enjoying themselves sexually, often through self-pleasuring or receiving oral or manual stimulation from others.
So, in summary, this tag refers to a video that involves a man who enjoys receiving oral sex from another man (faggot) and features scenes of women experiencing sexual pleasure or orgasmic bliss (Joi).