The joke in the post is about #polyamory. #Polyamorous (#poly) people like being part of consensual romantic relationships that involve not only one person, but multiple people.
The polyamorous community is part of the #queer and #LGBTQ umbrella and today heavily values informed consent, mental health awareness and individual expression.
(Side note: Polyamory is not to be confused with other practices sometimes referred to as polygamy, which encompasses multiple concurrent marriages and is often of a religious, traditional or patriarchal nature.)
There's many different shapes that polyamorous relationships can take. A common example is three people all dating each other (a 'triangle' or 'throuple'), but many polyamorous 'networks' involve many more than three people in various constellations, not necessarily all dating each other.
Polyamorous relationship networks regardless of shape are often called a 'polycule', which is a compound word combining 'poly' and 'molecule'. It refers to how a network diagram connecting the people in a polyamorous relationship would resemble a chemical molecule.
The 'rules' of polyamory depend entirely on what the participants consensually negotiated.
Some polycules require everyone to consent to new partners entering the polycule, some do not. Some are entirely closed, not accepting any additions at all; while others are wholly open. Some are only meant for committed romantic and sexual long-term relationships, while others specifically forbid sexual relations, and yet others do not mind either at all. Some polycules treat the multiplicity of partners like regular committed relationships, while others work on a 'don't ask, don't tell' basis.
Some polycules have rules that are considered 'hierarchical'. In hierarchical polycules, not every involved relationship is considered to be equal. For example, if a married couple brings additional people into their relationship, often the marriage enjoys special privileges: for instance, the married partners can 'veto' additional partners, while the additions cannot 'veto' the original marriage.
These hierarchical dynamics are often criticised.
While it's generally accepted that hierarchical polycules can work out, many say that such hierarchies are not sustainable for the long term and unfairly discriminate against the 'less important' partner ignoring their needs and emotions, leading to an unhealthy dynamic.
Many people in the poly community dislike hierarchical polyamory in general for such reasons, while others might consider them difficult to manage in a healthy way but ultimately possible.
The post is a reference to such an unhealthy hierarchical dynamic.
A 'hinge' exists in a polycule of three people, where one person dates both others while the other two do not date each other. The person in the middle is called a 'hinge'.
This can create issues related to jealousy, where both 'corner' partners compete over the 'hinge' in the middle. Without proper communication about emotions and needs, this can lead to unhealthy dynamics and emotional harm.
Codependency is a term for an often unhealthy dynamic between people. Codependent people cannot function in life without the other in some way; they might have adjusted their routines or emotional stability to depend entirely on the presence of the other person.
When the partner they depend on is absent for some reason or another, they break apart and cease to function.
While dynamics with a 'hinge' are already difficult, this becomes exponentially more difficult when someone is codependent on said 'hinge', because they need to share the person they're entirely dependent on.
"Mom said it's my turn to..." is a common joke template that has no bearing on this joke in particular.
It seems to be meant as a relatable and somewhat self-deprecating post for polyamorous people, referring to a frustrating dynamic that might be familiar to many poly people.
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