An agreement, usually verbal, between two consenting adults, usually acquaintances or colleagues, that an act of coitus commenced out of convenience, impulse and/or inebriation is 'meaningless' and will therefore be TOTALLY CONSEQUENCE FREE.
"Godammit, George: I thought we'd sorted all this out in our pre- fucktial agreement"
Ingenious Scottish fuckwit identification scheme, whereby knuckle-dragging denizens of whichever godawful weegie hinterland are encouraged to wear either green- or blue- and white leisure gear, with optional cigarrette burns, homemade tattoos, and/or adidas baseball caps, thereby allowing the rest of us to avoid them.
"You can always tell when the Old Firm has been in town, the bins have been ravaged for food, and every shop doorway has been shat in"
"Yes, but their shellsuits add such a nice splash of colour"