Walking On One's Lips
To be shit-faced drunk to the point of faceplanting the floor, and possibly having to use their lips to move across the room since they're too wasted to get up.
"You should've seen David the other night. He had so many drinks, the poor bastard was walking on his lips."
"Too much alcohol results in Walking On One's Lips"
"Too much alcohol results in Walking On One's Lips"