Lemon

1)Lemon is a popular term used in fanfiction, it refers to sexual acts. The term is based on the slightly squeamish feeling some get upon reading lemon, because of the in detail nature of it.
2)A sour yellow fruit

(Term 1)

Fangirl 1: Watcha reading?
Fangirl 2: Destiel lemons!
Fangirl 1: I love those!

(Type 2)
Person: No thanks, I can’t stand lemons, they are too sour for me.