shred the lettuce

lettuce = hair. shredding the lettuce means pushing or maneuvering hair in a certain direction.

barber: how do you do your hair usually?
guy: usually i just shred the lettuce to the side

Shred the Lettuce

The act of going down on a female and eating her out.

Shred the Lettuce.

Guy 1: Did you have sex with her last night?
Guy 2: No, But I shredded the Lettuce.

Male: I really want to shred the lettuce.
Female: What's shred the lettuce?
Male: It means I'm going to eat you out.