Also known as thanksgiving, a day where we forget about the rules of portions and stuff ourselves with plenty of good food.
person 1: Happy thanksgiving
person 2: I rather call it happy fat ass day
person 1: YOUR GONNA stuff yourself?
person 2: hell yeah <3
by maniban November 26, 2010
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1. When your ass just doesn't look good in anything , skirts , jeans , dresses. ANYTHING. Mainly affects women but gay and metrosexual men also suffer from it time to time.

2. When you don't want to be a nice guy and instead for just a day , turn into a badass. A bad ass day can starts from when you wake up to when you go to sleep , you may also have experience baddass dreams that night.
1. "My ass looked horrible yesterday . not even that weird Persian ghuy checked me out. It was the worst bad ass day"

2.

Oscar - "Was there any reason that you killed Mrs Porter's cat yesterday?"

Pete - "I was having a bad ass day"

Oscar - "Yeah I'm pretty sure the cops aren't going to take that into account".
by EthanStain October 3, 2013
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Once a month on a Monday. You choose. It’s on a Monday because it helps you get through all the shit Mondays throw at you.
by Ctinez October 6, 2018
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On April 12 every year is national Slap ass day. Take advantage this is the only day of the year you can slap a ass, single or taken today is your day
by National Dayz April 12, 2019
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Slap ass day is a different version of the last slap ass week but it’s only for a day
Boy”grabs ass”
Girl”WHAT ARE YOU DOING
Boy”It’s slap ass day
by GOD V9 January 13, 2020
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