https://idomavoice.com/in-massive-addy-when-an-error-becomes-a-trend/

In recent times, you may have come across posts or messages containing phrases like “In massive addy to me” or “In massive addy to my baby.”
These peculiar expressions have gained popularity among internet users, particularly as pre-birthday or pre-event wishes. While it may seem like a new and trendy way to wish someone in advance, it’s essential to clarify the meaning behind this peculiar term.
The term in question, “addy,” is not derived from the word “advance” as one might assume. Instead, it is an informal abbreviation or slang for the word “address.”
This abbreviation has found its way into casual conversations, text messages, and online communications when referring to either a physical location or an email address.
When used in a casual context, someone might ask, “What’s your addy?” to inquire about a person’s mailing address or email address.
The term has gained traction due to its brevity and informality, making it a convenient option for quick and straightforward communication.
However, it is important to note that the usage of “addy” in the context of pre-birthday or pre-event wishes is an error.
The confusion likely arose from individuals misinterpreting the intended meaning or inadvertently adopting a misused version of the term. Instead of conveying “advance” wishes, the phrase inadvertently conveys an invitation for individuals to share their addresses or locations.
As with any language trend, it’s crucial to be aware of the correct usage and meaning behind the words we employ. While “addy” has its place as a casual slang term for “address,” it is important to avoid misusing it in ways that may lead to confusion or unintended consequences.
By Ameh Ameh Comrade Godwin

Nigerians are naturally dumb so what do you expect

Massive addy to my heartthrob

Surely a Gen Z thing. I've never heard of this.