To brown loaf (one word): the act of leaving your unflushed crap in the toilet with the lid closed, so the next person to use the toilet is shocked and disgusted when he or she opens the lid to use it. The act of brown loafing takes commitment, as the person who brown loafs must sit through their entire crap without doing a self-courtesy flush.
I want to get my roommate back for that feather and shaving cream prank, so I'm going to brown loaf him tomorrow.
The act of sucking shit from a girls anus (therefore in the form of a loaf of bread) then spitting it back in her face.
While C-rizzle performed a brown loaf on magic (the dog), she bit his wiener.
Someone whos head is so big that blocks out the moon