holy crap! you better clean up your bathroom dude, someone triple evac'd so bad it looks like a jackson pollack painting
by spizm February 26, 2010

The act of blowing a fart while standing, opening up the fly on your jeans, and sitting rapidly to make the stench exit out of the fly into your own face for maximum enjoyment
by DocHoliday187 October 21, 2008

by Swaggy P jr April 22, 2018

When an individual evacuates (to avoid a storm or hurricane) to a location to stay with one that they have previously shacked with, or plan to shack with during the evacuation. A shack-evac typically occurs with an individual from a different area code than the shack-evacuee.
Valerie: What are your Hurricane Gustav evacuation plans?
Courtney: I think I am going to shack-evac to florida boys house.
Courtney: I think I am going to shack-evac to florida boys house.
by c.mahler October 17, 2008
