Gravy talking
The act of mumbling and slurring words simultaneously while speaking, resulting in a non-understandable statement.
Jamie: Hey, how's it going?
Hannah: Pretty good, actually; I just got a dubahbgdaboh...
Jamie: I'm sorry, what? You were gravy talking big time just then.
Hannah: Pretty good, actually; I just got a dubahbgdaboh...
Jamie: I'm sorry, what? You were gravy talking big time just then.