To put your hand/finger down a girls panties to get the smell of her vagina...

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.

The experiment a man uses before sex, in which he sticks his fingers inside the female's vagina, and proceeds to sniff it, to confirm that she does not have a smelly or diseased vagina.