Beyond even a lemon on the citrus scale. This is reserved for the lewdest of the lewd fanfics. The kind with fetishes not even DeviantArt would allow. Some time’s there’s barely even a plot, just nothing but the author’s oddly specific and/or gross as fuck fetish and copyrighted characters participating in them. You, a person finding such a fanfic, were either looking for it or you made the mistake of asking for context when somebody joked about the grapefruit.
If you go out and pick grapefruits, be warned that Rule 36 will be constantly proven to you the hard way.
Bob: Alice’s Harry Potter grapefruit is something else, man. What perverted mind wants to read about Hermione getting a Manhattan transfer from Luna?
David: A Manhattan what-now?
Bob: You don’t want to know.
Used to describe one who is extremely passive, diffident, and introverted. Usually very bad at socializing.
That guy can't talk to anyone without having a panic attack. What a grapefruit.
A large tropical citrus fruit with a very sweet taste to it. Also can be used as slang for a woman's boobs.
Oooh this grapefruit is swwweeeeeeeettttt.
Did you see the grapefruit's on that girls chest?!
An insult. Similar to being an idiot or a wally.
I just failed my test
You’re such a grapefruit
1: Do you like grapefruit?
2: Yep.
1: What do you like about grapefruit?
2: It's big and juicy
A genre of smut that is more intense than lemon. That’s right, the KINKY shit. BDSM, vore, fetishes, whatever weird shit you think of, it exists. Lemon is child’s play compared to grapefruit.
“Yo dude last night I was reading some grapefruit.”
“Wtf bro I don't need to know that”
“Wanna see”
“Sure.”