(mathematical analysis) Upper bound function; see big O notation. / (slang, usually preceded by "the") Orgasm.

(baseball) A home run.

(informal) A large truck, an 18-wheeler.

(informal) The city of New Orleans, Louisiana

(idiomatic) The mouth of someone who talks too much, especially by making exaggerated claims or by inappropriately revealing information.

(astronomy, especially US) A bright circumpolar asterism of the northern sky, said to resemble a ladle or cart. It is part of the constellation Ursa Major and includes the stars Mizar, Dubhe, and Alkaid. The other stars in it are Alioth, Megrez, Merak, and Phecda.

(vulgar, slang) Very large, expansive, fat, impressive, muscular, intimidating, or important

(idiomatic) Lots of money.

The totality of a situation. / (Britain, dated) The main film in a double feature. / Used other than figuratively or idiomatically: see big, picture.

(informal) A man of importance by reason of power, size or seniority. / (informal) In the southern United States, the male head of a household, or sometimes a grandfather