Definition
To start a new endeavor enthusiastically and wholeheartedly, though possibly without experience.
Also Said As
- dive in
- plunge into
How People Actually Use It
Whenever a man inserts his entire head into a woman's vagina.
"Steve: "Hey Mark, I saw you went home with Cindy last night. How did that turn out?" Mark: "Dude I nearly died last night. She made me take a PLUNGE INTO DARKNESS, I passed out inside of her.""
Source: Urban Dictionary