It's when a person becomes overly obese
My classmate went home for summer break and came back completely walrused.
When you're in Texas and you lose power because of Centerpoint's neglect and mismanagement and it's 100 degrees outside so you splash a quart of water on your tile floor and lay there naked like a Walrus in the third world.
Don't bother Danny today, he's been Centerpoint Walrusing since Hurricane Beryl.
The act of overdoing it in relation to food, booze, or anything that is not healthy.
On my 40th birthday I was walrusing hard and ended up gaining 12 pounds.