Robert Frost it 

to discontinue a pleasant activity or or leave an entertaining event prematurely due to prior engagements or commitments

"Hey man, this party is really picking up."
"I know, but I promised my friend I'd go party at his place. I'm gonna Robert Frost it."

Robert Frost it by Ra$PutiN January 1, 2012

Robert Frostitute 

Person who shows affection when given books or literature; a gold digger for books

“ I had to break up with that librarian, man. She’s a real Robert Frostitute, and I’m broke from taking her to Barnes and Noble.

Robert Frostitute by Slaggy D July 14, 2019