an ace in cards or a "one" in dice / the first or top item

a pin, such as a hairpin, tie pin, bowling pin, or golf pin

(ethnic slur) an American person, Yankee.

car made in the United States

website that specializes in reposting BBS (2channel, etc.) or social media conversation extracts

use one thing for many purposes / work someone hard

to use one's head

(literary) they (about women or girls)

アメ公: (ethnic slur) an American person, Yankee.

(politics, slang) A politician who submissively subscribes to the interests and policies of the United States; an American puppet.