cousin (usually as a term of address, but not necessarily towards one's cousin)
"Hey cuz, did you see what happened at the game?"
In plain English: Cuz is an informal way to say cousin, often used by friends and family members who are close.
"The old guy who used to live down the street is still living in this house cuz he can't afford anything else."
Usage: Use "cuz" informally to refer to or directly address a close friend who is also your relative. It functions primarily as a casual nickname rather than a formal title for family members.
because
"I canceled my plans cuz it started raining unexpectedly."
because
"I stayed inside cuz it was raining outside."
Cuz is simply a shortened version of the word cousin used to refer to a relative or friend. It entered common usage as an informal abbreviation rather than having a distinct original meaning different from its full form.