1. sex

2. Hot chick who never seems to go out with anyone.

3. A female that you know you can't become involved with past the point of friendship. This may be due to having a boyfriend/not being interested in you/or too busy to be involved with anyone. She's like the real forbidden fruit. You can't have a taste of her.

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.

You know that really hot chick who won't seem to date anyone? She's forbidden fruit.
You know that chick who's quite prude? Her snatch is the forbidden fruit.

Someone who is attractive but is illegal or taboo to jave sex with, for example a family member, a married person, an underage person etc.

something that is attractive because it is denied to one (From the Garden of Eden in the bible.)

The Forbidden Fruit or Tide Pod is a delicious snack usable by all people.

A man who despite incredible sexual ability rarely engages in sexual activity to increase his desirability amongst women.