A thin liquid food of oatmeal or other meal boiled in milk or water.

A swimmer

Gruel is A water soup, was fed to orphan's as in the movie and book Oliver Twist (also features in a simpsons episode(as Krusty brand Gruel))A greyish colour very water down and often based on potatoes, or wheat and other starch tasting vegies.

Shit Rory would eat

Gruel is Daughter Gruelina's (my child) favorite and only food she’s every or will eat. Her future is so dull I don’t even need glasses to see it.

cool and great combined

Used to explain the act of doing something not for current enjoyment and being in an existential state of being living for the sake of continuation.