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Verb. The action of very deliberately not saying hello, or giving any sort of recognition to a person you know in the hall, even when you have a strong relationship with that person, and may or may not have had a conversation ABOUT giving salutations when meeting.
"dude i was totally frackabacking on my cat but then i realized it was too cheap for me"

"dude we were at a game park and we were walking through the grass and we saw a puma, and kendall started frackabacking on its face!! he needs 22 stitches!"
by ihaveacousin February 24, 2010