Also known as the homo cop-out, this is the act of calling something or someone a homosexual either to diffuse a situation or obtain a desired result. Most often used in groups of guys between middle school and college.
Example 1: Guy1: I have such a awesome six-pack!
Guy2: Really? Prove it.
Guy1: No! Are you gay!?! (Also acceptable: No! That would be gay!)
Example 2: Guy1: Dude come watch this hilarious video!
Guy2: *after watching* Wow, that wasn't funny at all...
Guy1: Your so gay.
Example 3: Guy1: *on phone with Guy2* Dude! You should come to this party, there are all these hot chicks and beer! It's sweet!
Guy2: No thanks. I have better things to do than be arrested for anyone of the likely illegal activities you partaking in.
Guy1: Wow, your such a fag...
Guy2: Um.... ok.... I'll be right over!
*This is a required plug for the word Faggot Fallacy, thanks UD!*