greenlighting
n.— «Greenlighting is when a male or female (often bisexual) will wear a green shirt, either polo or otherwise, and “pop” or pull their collar up. This marks them as being ready for sex with anyone who chooses them, be it male or female, they are “collared” when someone approaches them and pulls their collar down. This leads to sexual intercourse in most cases or sodomy when both partners are male.» —“General Greenlighter FAQ” by MadChad41 Greenlighter.org July 2, 2005. (source: Double-Tongued Dictionary)