In a total state of mammal-ness. Way too fucked up. To operate at only the most basic levels of humanity. Derived from the word mammal
. Under the influence of any booze or drugs to the most extreme limit. Similar to being pissed
(UK) or shitfaced
"Dude, I was so fucking Mammied last night! It was awsome." or "Let's get mammied!" or "Fast Ed, why do you insist on getting so mammied every night? Look at yourself, your a complete mammal!"