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1.
This is what a person says when he is making a tentative appointment.

"I'll Pencil" (because the appointment can be erased) "you in" (to my schedule book).
Ozzy: Hey, can I come up to your big fancy office and make fun of you?
Boohiss: Er. I'm kinda busy this week. Tell you what, I'll pencil you in for 4:30 on Thursday.
by boohiss May 20, 2004
 
2.
When somebody wants to schedule something with you, but you don't want to use a pen to finalize it in your calendar because that person is a loser. If something better comes along -- you can erase it.
Sure, I'd love to watch slides from your trip to the Grand Canyon -- I'll pencil you in.
by Kid May 20, 2004
 
3.
A nice way to say "fuck off...im not interested"
Girl: Want to go out friday night? I'll bring pictures of my horse!
Guy: ...Um....I'll Pencil You In.
by BlackCotton May 20, 2004
 
4.
tenatively allocate time to meet, see, or conversate
We should get together. I'll pencil you in for 6:00.
by Noah Bizzle May 19, 2004
 
5.
To schedule someone for a meeting.
To enter an appointment into an appointment book with pencil.
I'll pencil you in for a meeting.
by Pencil DIck May 20, 2004
 
6.
Informal idiom meaning to make an appointment for someone; to "pencil them in" to the schedule.
"Can I see the doctor right away?"
"No, but I can pencil you in for a two o'clock appointment."
by Hobo Bob May 19, 2004
 
7.
To make definite plans to meet with someone. As in writing your name in an appointment book.
I'm free Thursday afternoon, so I'll pencil you in.
by jafo May 19, 2004