(noun) An American brand of modern clothing that is going to hell. Typical GAP t-shirts display the brand in large caps on the front of the shirt. If worn in public, you will be observed as the acronym most people have adopted for the GAP brand, "gay and proud".
In other words, don't buy their t-shirts.
"Hey, man, look at the new GAP t-shirt I bought!"
"So... you're gay
"Hey! Hey, everyone! This guy is homo and likes it!"