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In language, “GAC” falls into many grammatical categories.

It can be used as a verb, both transitive (Mary GACed John) and intransitive (John was GACed by Mary).
It can be an action verb (John really gives a GAC), a passive verb (Mary really doesn’t give a GAC), an adverb (Mary is GACing interested in John), or as a noun (Mary is a terrific GAC).
It can also be used as an adjective (Mary is GACing beautiful) or an interjection (GAC! I’m late for my date with Mary).
It can even be used as a conjunction (John is ugly, GAC, he’s also stupid).
As you can see, there are very few words with the overall versatility of the word “GAC.”

Aside from its sexual connotations, this incredible word can be used to describe many situations:

• Surprise – “What the GAC are you doing here?”
• Fraud – “I got GACed by the car dealer.”
• Resignation – “Oh, GAC it!”
• Trouble – “I guess I’m GACed now.”
• Aggression – “GAC YOU!”
• Disgust – “GAC me.”
• Confusion – “What the GAC…?”
• Difficulty – “I don’t understand this GACing business!”
• Despair – “GACed again….”
• Pleasure – “I GACing couldn’t be happier.”
• Displeasure – “What the GAC is going on here?”
• Lost – “Where the GAC are we?”
• Disbelief – “UN-GACING-BELIEVABLE!”
• Retaliation – “Up your GACing ass!”
• Denial – “I didn’t GACing do it.”
• Perplexity – “I know GAC-all about it.”
• Apathy – “Who really gives a GAC, anyhow?”
• Greetings – “How the GAC are ya?”
• Suspicion – “Who the GAC are you?”
• Panic – “Let’s get the GAC out of here.”
• Directions – “GAC off.”
• Awe – “How the GAC did you do that?”

Other uses for the word “GAC”:

• It can be used in an anatomical description — “He’s a GACing asshole.”
• It can be used to tell time — “It’s five GACing thirty.”
• It can be used in business — “How did I wind up with this GACing job?”
• It can be maternal — “MotherGACer.” It can be political — “GAC Clinton!”

It has also been used by many notable people throughout history:

“What the GAC was that?” — Mayor of Hiroshima
“Where did all these GACing Indians come from?” — General Custer
“That’s not a real GACing gun, is it?” — John Lennon
“Who’s gonna GACing find out?” — Richard Nixon
“Why the GAC did that apple hit me?” — Issac Newton
“Heads are going to GACing roll.” — Marie Antoinette
“I could have used a GACing map.” — Ulysses
“Where the GAC is all this water coming from?” — Captain of the Titanic
“Any GACing idiot could understand that.” — Albert Einstein
“It DOES SO GACing look like her!” — Picasso
“Okay, I know… we’ll build this BIG GACing wall to keep them out.” — Emperor of the Ch’in Dynasty
“I can’t believe I just GACing said that.” — Patrick Henry
“GACing backstabbers!” — Julius Caesar
“You want what on the GACing ceiling?” — Michelangelo
“Fellatio is not GACing!” — Bill Clinton
“Where is that GACing pizza guy?” — Elvis
“Why? Because its GACing there!” — Sir Edmund Hilary
“I don’t suppose its gonna GACing rain?” — Joan of Arc
“Scattered GACing showers my ass.” — Noah
“I need this parade like I need a GACing hole in my head.” — John F. Kennedy
“What are the GACing chances I’m going to heaven?” — Adolf Hitler
“Hey, where the GAC are your turbans?” — Christopher Columbus when he discovered the “Indians”.