The color pink, especially when worn by a man who doesn't want to admit he's actually wearing pink. Popularized by the machinima Red vs Blue, in which Pvt. Donut wears this color.
Donut: It's not pink, it's like a... a lightish red.
Grif: Guess what, they already have a color for lightish red. You know what it's called? Pink.
Donut: ...I hate you guys.
Grif: Donut, I understand the need to safeguard your masculinity, but realy man, it's a whole faster just to say pink.