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The act of greasing one's body passage or orifice in anticipation of what will surely be the fucking of a lifetime. This term is is rarely used in the literal sense and more often found to be describing acts done to preempt a dire consequence of inaction.
"Dude, the boss will go apeshit if we don't get those reports done for the meeting on Friday"

"Relax, I pre-greased us last week by blaming the computer, we should be good."
by tokyotapes October 30, 2009
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