The colloquialism buck (much like the English "quid") is often used to refer to dollars of various nations, including the U.S. dollar. This term, dating to the 18th century, may have originated with the colonial fur trade. Greenback is another nickname originally applied specifically to the 19th century Demand Note dollars created by Abraham Lincoln to finance the costs of the Civil War for the North. The original note was printed in black and green on the back side. It is still used to refer to the U.S. dollar (but not to the dollars of other countries).
Grand, sometimes shortened to simply G, is a common term for the amount of $1,000. The suffix K (from "kilo-") is also commonly used to denote this amount (such as "$10K" being pronounced "Ten kay" to mean $10,000). Banknotes' nicknames are usually the same as their values (such as five, twenty, etc.) The $5 bill has been referred to as a "fin" or a "fiver" or a "five-spot;" the $10 bill as a "sawbuck," a "ten-spot," or a "Hamilton"; the $20 bill as a "double sawbuck," a "twomp," a "twenty-banger," or a "Jackson;" the $1 bill is sometimes called a "single," the $2 bill a "deuce" or a "Tom," and the $100 bill is nicknamed the hunsky, a "Benjamin," "Benjie," or "Frank" (after Benjamin Franklin, who is honored on the note), or a C-note (C being the Roman numeral for 100) or a Century Note. Occasionally these will be referred to as "dead presidents," although neither Hamilton ($10) nor Franklin ($100) was President. $100 notes are occasionally referred to as 'large' in banking ("twenty large" being $2,000, etc.). The newer designs are sometimes referred to as "Bigface" bills.
Source - wikipedia
