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1.
18 hundred is a alcoholic drink made of taquilla and rum
Man that 1800 makes me flip you gotta give me more or your gonna make me kill a nigga
by ziothore July 16, 2005
 
2.
About a century of time: all those years starting with 18, 1800-1899. A trifle different than nineteenth century, which is 1801-1901.

Often confounded with "Victorian," which is the period 1840-1901 when Victoria was Queen of England, which had several subordinate periods of fashion, technology, and culture (as a rational person ought to expect from 60 years). The 1800s included such political eras as the Napoleonic period (he became First Consul in 1802), the Regency (English rule by the Prince Regent, 1811-1821), the Second Empire in France, the Civil War/War Between the States, the Crimean War, the Franco-Prussian War, &c. Many schools of art date from the 1800s, such as the Impressionists. Music advanced from the relatively dispassionate intellectuality of the Baroque into the greater emotionality of Classical music (say, Beethoven), the Romantic composers like Liszt, the Impressionists like Debussy, to the full-bore multi-media entertainment of Wagner.

It also has a strong crossover with the Steam Age, of technology powered by indirect use of energy, fire creating mechanical movement, leading eventually to the harnessing of electricity, the expansion of communication in the telegraph and telephone and the beginnings of electronics in Tesla's radio.
Pictures of naval insignia from the 1800s to the present time.

A history of the area from the late 1800s from an Arab nationalist perspective.

In this humorous and fictitious set of letters, a young boy writes to his family and friends in the late 1800's.
by InterDTimeT December 01, 2009
 
3.
It literally means Fuck you. The obamacare phone number is 1800f1uckyo, which everyone basically calls it 1800 fuck you. A shortened version is 1800 used towards someone in a derogatory fashion.
John: Your a dbag
Jack: Oh yeah, you know what, 1-800
by awsomeocartman January 23, 2014
 
4.
Meaning cheap, tacky or free.

Note: 1800 is the "toll free" prefix telephone number in Australia.
Sarah takes home so many boys, shes so 1800.
by James William Dumay January 01, 2006