8
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
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9
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!
by Horny B April 27, 2008
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10
It literally means that someone will give you the details of something, but is usually just someone trying to give you the runaround.
"What happened with you and your girlfriend?"
"I'll pencil you in later."
by Jessica May 20, 2004
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