1) Gaseous particulate that emerges from one's butthole, known colloquially as a fart.
2) The condition of the atmosphere after a donkey has spent time in it.
1) Some asshole's ass air has really fouled the air.
2) I wish you'd keep your donkey outside; the whole room reeks of ass air.
Similar to the phrase "Blowing smoke up my ass" but telling a person a lie to avoid telling the truth. This is especially done when caught in the wrong or other compromising positions.
"Jim caught his wife with another man at McDonalds; they were holding hands and everything!"
"Really, what happened?"
"Well she started trying to say the guy was just a friend"
"Seriously?"
"yep, I heard Jim kicked her ass to the curb, now she's staying with her 'friend' at his place."
"Man doesn't that beat all."
"Yes sir. I don't know how he's handling it so well... I would kill my wife if she was cheating on me, and then tried Blowing Air Up My Ass."
Brought to public attention by Bob Woodward and Carl Bernstein in the book on the fall of Richard Nixon, All The President’s Men, ratfucker was Nixon’s term for a political operative who sows chaos among opponents; an agent provocateur. It is thought to have originated among campus political rivalries at USC, and seems to have some usage in the US military.
Along with Nixon’s other ratfuckers, Roger Stone caused fights at otherwise peaceful Democratic Party protests to generate a false narrative that the Democrats were violent and dangerous.