A phrase to describe someone who is cognitively degenerating. Synonym of "going off the deep end". Can have varying degrees of severity.

Reference to the song "Hey You" by Pink Floyd. The line "and the worms ate into his brain" makes no sense in an otherwise linear and literal narration throughout the lyrics.

Any unidentified, nasty, liquid-like substance; usually very questionable in what the hell it actually is...

to take the last of something and not throw away the box or container that it came in, usually causing much anger in the next person to examine the aforementioned box.