However, it's likely a variation on other similar expressions:
* "Get off my back": This means to stop bothering or annoying someone.
* "Get out of my face": This is a more aggressive way of telling someone to leave you alone, often implying anger or frustration.
* "Get off my case": Similar to "get off my back," this means to stop criticizing or nagging someone.
Therefore, "get off my face" could potentially be understood as a way of telling someone to stop bothering you, although it's not a widely recognized idiom.
If you could provide more context about where you heard this phrase, I might be able to offer a more specific interpretation.