1) Describes a female’s ass, while standing, you could set a beer can on it. Generally found on Afro-American women. Although their asses are nice, a beercan is rarly found on white, hispanic, or asian women.
2) The obvious - a can used to hold a fermented liquid made of hops and barley.
Brought to public attention by Bob Woodward and Carl Bernstein in the book on the fall of Richard Nixon, All The President’s Men, ratfucker was Nixon’s term for a political operative who sows chaos among opponents; an agent provocateur. It is thought to have originated among campus political rivalries at USC, and seems to have some usage in the US military.
Along with Nixon’s other ratfuckers, Roger Stone caused fights at otherwise peaceful Democratic Party protests to generate a false narrative that the Democrats were violent and dangerous.