Something you really want and think you are going to get and then it doesn't happen for you. The genesis of the term was an actual grab of an ass that went bad.
"I thought I had that job promotion in the bag, but it turned out to be just another ill-fated ass grab."
It's the same day as "national grab ass day", which someone defined as April 11th.
Basically if a guy grabs ass without consent, he's asking to get his hand broken.
boy who grabs my ass: I can do that because UD says it's national grab ass day
me, after I break his hand : and I broke your hand because it's also National grab my ass and I'll break your hand day
You thought April 11th was the only ass grab day, but you were wrong. We need more than one day a year to grab ass. So go up to a girl, grab their ass, and they can't take legal action. Because is ass grab day.
She said she would take me to court then I reminded her it was National Ass Grab Day (#2).