The act of taking a piss out of your ass, usually after a night of heavy drinking. Its a combination of taking a #1 and #2 out of your ass at the same time.
5.1 refers to the state you are in when you become really loud after a drinking session. The 5.1 originates from the surround sound speaker system and hence you can hear the person from every angle.
1) Easy mate you on a 5.1 2) Turn it down bruv u reachin 5.1
When you are doing it doggie style, and you make her lay down, while you are still inserted, and have her perch her butt in the air a little bit, and go at it like that.
"1/5 hump reverbiration is the best position ever, its like doggie, laying down"
516 is the area code for Nassau County, New York on Long Island. The 516 includes excellent places to blaze up the chronic, including HEMPsted, Jones Beach, and Teddy Roosevelt's grave.
It's much better to blaze up in the 516 than in the 631 with all those Suffolk Countypussy poseurs.