Here are some possible interpretations:
* Affectionate: It can simply be a way to express affection and fondness for someone, emphasizing their shortness in a playful or endearing way.
* Exclusive: "Only" implies that this person is special and unique to the speaker, suggesting a close relationship.
* Familiarity: It can also be a term used between close friends or family members, indicating a comfortable and casual relationship.
However, it's important to note that:
* Context matters: The meaning can change depending on the speaker's tone, the situation, and the relationship between the people involved.
* Potential for misinterpretation: Some people may find the term offensive or disrespectful, particularly if it's used in a derogatory way.
It's always best to consider the context and the relationship between the individuals involved before interpreting the meaning of a phrase like "my only shorty."