During sex, when a man and a woman share a double sided dildo, thus simultaneously penetrating the anus of both individuals during vaginal intercourse.
I had a Buck Double last night. It wasn't at all what I expected, and I can't believe they actually advertise it in public.
When you take a Burger King Buck double and split it at the pattties and put another Buck double inside the two meat patties with buns to make one singe sandwich out of two buck doubles.
A double Aut Buck is a derogatory term for a black person. It refers to the fact that most of them have big lips that are usually audited in the middle.
For example, hey look at that double aut buck over there! He must be a real scumbag!
"Double-barrel buck shot" is actually mixing 2 related terms. "Double-barrel" is any gun using two barrels; they can be "over-under" or side-by-side. Here Beck is referring to a shotgun, because he follows that by saying "buck shot" which, btw, is generally written "buckshot" (one word). Shotgun shells are generally filled with small pellets that spread out after they leave the barrel. Buckshot is larger, heavy pellets used for home defense or hunting large game - like a "buck," which is a male deer. Hence the name.
To punish Beck for inventing the term double-barrel buck shot, I grabbed my grandfather's double barrel from over the fireplace and unloaded two rounds of buckshot into Beck's ass.