A phrase meaning that the speaker intends to add the listener to a list, or make an appointment for the listener to attend a meeting at a later time.
(Pencil, a noun, is being used as a verb for the action associated with it.)
Fred: I need help with my homework.
Daphne: I'm not free until 6.30. I'll pencil you in for then if that's OK.
Fred: It's a date.
The act of popping one's zits with their penis.
Harry was pencil popping me because I couldn't reach my zit.
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.
Forcefully inserting a person's erect penis into a woodchipper
Formerly used by romanian gypsy gangs as an execution method, showcasing their brutality
Amadeus: "hei gringo ții minte că i-ai dat ministrului apărării romanian pencil sharpner?"
Gringo: "da"
To sexually assult/stimulate someone with a pencil, usually rubber end first for safety.
Oi, come here you silly slag... I'll pencil you in!
To murder someone by forcefully inserting a pencil into their forehead.
Originated from the 2008 film "The Dark Knight" where the film's villain, the Joker killed a gang member via this method.
"We're going to crack down on them and make some pencils disappear."
"We're making a pencil disappear tonight!"
The act of cutting a whole into a living or nonliving human being's head and fornicating with the wound
That German Pencil Sharpener made my shlong extra sharp!