When you see a hottie, or something very nice like a car that you want, its an excellent sentence to describe how you feel about it. Or how whats in your pants feels about it.
Joe: "Dude, look at that Cadillac Escalade."
Alex: "That makes my pants tight."
Should you survive a gunshot wound/knife stabbing/drive by/ getting hit by a car and still be standing, this phrase should be said, followed by a smirk. It is garuanteed to cause a massive drop in your attackers' morale, and they may even turn tail and run.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi